Microsoft has released security bulletin MS14-021. Learn more about how to obtain the fixes that are included in this security bulletin:
For individual, small business and organizational users, use the Windows automatic updating feature to install the fixes from Microsoft Update. To do this, see Get security updates automatically
Internet Explorer will crash if you try to install this security update on a Windows 7-based system that does not already have security update 2929437 installed. To avoid this issue, take either of the following actions:
Install security update 2929437, and then install security update 2964358. For more information about security update 2929437, click the following article number to view the article in the Microsoft Knowledge Base:
Description of the security update for Internet Explorer 11 on Windows 7 and Windows Server 2008 R2: April 8, 2014
Install security update 2964444 instead of security update 2964358. Security update 2964444 is intended for systems that do not have security update 2929437 installed.
The English (United States) version of this software update installs files that have the attributes that are listed in the following Tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.
Windows XP and Windows Server 2003 file information
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The files that apply to a specific milestone (SPn) and service branch (QFE, GDR) are noted in the "SP requirement" and "Service branch" columns.
GDR service branches contain only fixes that are broadly released to address widespread, critical issues. QFE service branches contain hotfixes in addition to broadly released fixes.
In addition to the files that are listed in these Tables, this software update also installs an associated security catalog file (KBnumber.cat) that is signed with a Microsoft digital signature.
Internet Explorer 6
Internet Explorer 6 on all supported 32-bit versions of Windows XP
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File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.13.0
231,288
04-Sep-2013
11:28
x86
None
Not applicable
Mshtml.dll
6.0.2900.6550
3,094,528
30-Apr-2014
05:23
x86
SP3
SP3QFE
Internet Explorer 6 on all supported 32-bit versions of Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
221,488
08-Jul-2010
14:23
x86
None
Not applicable
Mshtml.dll
6.0.3790.5328
3,164,672
30-Apr-2014
15:52
x86
SP2
SP2QFE
Internet Explorer 6 on all supported Itanium-based versions of Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
501,552
01-May-2014
04:40
IA-64
None
Not applicable
Mshtml.dll
6.0.3790.5328
9,471,488
01-May-2014
04:39
IA-64
SP2
SP2QFE
Wmshtml.dll
6.0.3790.5328
3,164,672
01-May-2014
04:39
x86
SP2
SP2QFE\WOW
Internet Explorer 6 on all supported x64-based versions of Windows XP and Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
293,168
01-May-2014
04:40
x64
None
Not applicable
Mshtml.dll
6.0.3790.5328
6,067,200
01-May-2014
04:39
x64
SP2
SP2QFE
Wmshtml.dll
6.0.3790.5328
3,164,672
01-May-2014
04:39
x86
SP2
SP2QFE\WOW
Internet Explorer 7
Internet Explorer 7 on all supported 32-bit versions of Windows XP
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.13.0
231,288
04-Sep-2013
11:28
x86
None
Not applicable
Mshtml.dll
7.0.6000.21383
3,628,032
30-Apr-2014
08:01
x86
SP3
SP3QFE
Internet Explorer 7 on all supported 32-bit versions of Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
221,488
08-Jul-2010
14:23
x86
None
Not applicable
Mshtml.dll
7.0.6000.21383
3,628,032
30-Apr-2014
13:16
x86
SP2
SP2QFE
Internet Explorer 7 on all supported Itanium-based versions of Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
501,552
01-May-2014
02:07
IA-64
None
Not applicable
Mshtml.dll
7.0.6000.21383
10,157,568
01-May-2014
02:02
IA-64
SP2
SP2QFE
Wmshtml.dll
7.0.6000.21383
3,628,032
01-May-2014
02:02
x86
SP2
SP2QFE\WOW
Internet Explorer 7 on all supported x64-based versions of Windows XP and Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
293,168
01-May-2014
02:07
x64
None
Not applicable
Mshtml.dll
7.0.6000.21383
5,737,472
01-May-2014
02:07
x64
SP2
SP2QFE
Wmshtml.dll
7.0.6000.21383
3,628,032
01-May-2014
02:07
x86
SP2
SP2QFE\WOW
Internet Explorer 8
Internet Explorer 8 on all supported 32-bit versions of Windows XP
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.13.0
231,288
05-Jul-2010
13:15
x86
None
Not applicable
Mshtml.dll
8.0.6001.23588
6,022,144
30-Apr-2014
08:13
x86
SP3
SP3QFE
Internet Explorer 8 on all supported 32-bit versions of Windows Server 2003
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
SP requirement
Service branch
Spuninst.exe
6.3.4.1
221,488
08-Jul-2010
14:23
x86
None
Not applicable
Mshtml.dll
8.0.6001.23588
6,022,144
30-Apr-2014
09:40
x86
SP2
SP2QFE
Internet Explorer 8 on all supported x64-based versions of Windows XP and Windows Server 2003
Windows Vista and Windows Server 2008 file information
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The files that apply to a specific product, milestone (SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following Table:
Collapse this tableExpand this table
Version
Product
Milestone
Service branch
6.0.6002.18xxx
Windows Vista SP2 and Windows Server 2008 SP2
SP2
GDR
6.0.6002.23xxx
Windows Vista SP2 and Windows Server 2008 SP2
SP2
LDR
GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
Internet Explorer 7
Internet Explorer 7 on all supported 32-bit versions of Windows Vista and Windows Server 2008
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File name
File version
File size
Date
Time
Platform
Mshtml.dll
7.0.6002.19087
3,627,520
29-Apr-2014
13:10
x86
Mshtml.tlb
7.0.6002.19087
1,383,424
29-Apr-2014
11:42
Not applicable
Mshtml.dll
7.0.6002.23377
3,628,544
29-Apr-2014
13:44
x86
Mshtml.tlb
7.0.6002.23377
1,383,424
29-Apr-2014
12:16
Not applicable
Internet Explorer 7 on all supported Itanium-based versions of Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Mshtml.dll
7.0.6002.19087
10,160,640
29-Apr-2014
13:14
IA-64
Mshtml.tlb
7.0.6002.19087
1,383,424
29-Apr-2014
11:57
Not applicable
Mshtml.dll
7.0.6002.23377
10,162,176
29-Apr-2014
12:54
IA-64
Mshtml.tlb
7.0.6002.23377
1,383,424
29-Apr-2014
11:51
Not applicable
Mshtml.dll
7.0.6002.19087
3,627,520
29-Apr-2014
13:10
x86
Mshtml.tlb
7.0.6002.19087
1,383,424
29-Apr-2014
11:42
Not applicable
Mshtml.dll
7.0.6002.23377
3,628,544
29-Apr-2014
13:44
x86
Mshtml.tlb
7.0.6002.23377
1,383,424
29-Apr-2014
12:16
Not applicable
Internet Explorer 7 on all supported x64-based versions of Windows Vista and Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Mshtml.dll
7.0.6002.19087
5,737,472
29-Apr-2014
13:40
x64
Mshtml.tlb
7.0.6002.19087
1,383,424
29-Apr-2014
12:12
Not applicable
Mshtml.dll
7.0.6002.23377
5,737,472
29-Apr-2014
14:46
x64
Mshtml.tlb
7.0.6002.23377
1,383,424
29-Apr-2014
13:38
Not applicable
Mshtml.dll
7.0.6002.19087
3,627,520
29-Apr-2014
13:10
x86
Mshtml.tlb
7.0.6002.19087
1,383,424
29-Apr-2014
11:42
Not applicable
Mshtml.dll
7.0.6002.23377
3,628,544
29-Apr-2014
13:44
x86
Mshtml.tlb
7.0.6002.23377
1,383,424
29-Apr-2014
12:16
Not applicable
Internet Explorer 8
Internet Explorer 8 on all supported 32-bit versions of Windows Vista and Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Mshtml.dll
8.0.6001.19529
6,020,608
29-Apr-2014
20:18
x86
Mshtml.tlb
8.0.6001.19529
1,638,912
29-Apr-2014
19:28
Not applicable
Mshtml.dll
8.0.6001.23588
6,022,144
29-Apr-2014
22:13
x86
Mshtml.tlb
8.0.6001.23588
1,638,912
29-Apr-2014
21:28
Not applicable
Internet Explorer 8 on all supported x64-based versions of Windows Vista and Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Mshtml.dll
8.0.6001.19529
9,348,096
29-Apr-2014
21:23
x64
Mshtml.tlb
8.0.6001.19529
1,638,912
29-Apr-2014
20:30
Not applicable
Mshtml.dll
8.0.6001.23588
9,349,120
29-Apr-2014
22:36
x64
Mshtml.tlb
8.0.6001.23588
1,638,912
29-Apr-2014
21:47
Not applicable
Mshtml.dll
8.0.6001.19529
6,020,608
29-Apr-2014
20:18
x86
Mshtml.tlb
8.0.6001.19529
1,638,912
29-Apr-2014
19:28
Not applicable
Mshtml.dll
8.0.6001.23588
6,022,144
29-Apr-2014
22:13
x86
Mshtml.tlb
8.0.6001.23588
1,638,912
29-Apr-2014
21:28
Not applicable
Internet Explorer 9
Internet Explorer 9 on all supported 32-bit versions of Windows Vista and Windows Server 2008
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Mshtml.dll
9.0.8112.16546
12,347,392
29-Apr-2014
10:28
x86
Mshtml.tlb
9.0.8112.16546
2,382,848
29-Apr-2014
10:07
Not applicable
Mshtml.dll
9.0.8112.20657
12,348,416
29-Apr-2014
09:49
x86
Mshtml.tlb
9.0.8112.20657
2,382,848
29-Apr-2014
09:36
Not applicable
Internet Explorer 9 on all supported x64-based versions of Windows Vista and Windows Server 2008
Windows 7 and Windows Server 2008 R2 file information
Collapse this imageExpand this image
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following Table:
Collapse this tableExpand this table
Version
Product
Milestone
Service branch
6.1.7600.17xxx
Windows 7 and Windows Server 2008 R2
RTM
GDR
6.1.7600.21xxx
Windows 7 and Windows Server 2008 R2
RTM
LDR
6.1.7601.18xxx
Windows 7 and Windows Server 2008 R2
SP1
GDR
6.1.7601.22xxx
Windows 7 and Windows Server 2008 R2
SP1
LDR
GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
Internet Explorer 8
Internet Explorer 8 on all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:12
Not applicable
Mshtml.dll
8.0.7601.18446
6,041,600
29-Apr-2014
17:14
x86
Mshtml.tlb
8.0.7601.18446
1,638,912
29-Apr-2014
14:01
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:13
Not applicable
Mshtml.dll
8.0.7601.22657
6,041,600
29-Apr-2014
16:20
x86
Mshtml.tlb
8.0.7601.22657
1,638,912
29-Apr-2014
13:38
Not applicable
Internet Explorer 8 on all supported Itanium-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:02
Not applicable
Mshtml.dll
8.0.7601.18446
17,474,048
29-Apr-2014
12:32
IA-64
Mshtml.tlb
8.0.7601.18446
1,638,912
29-Apr-2014
11:24
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:07
Not applicable
Mshtml.dll
8.0.7601.22657
17,475,584
29-Apr-2014
15:00
IA-64
Mshtml.tlb
8.0.7601.22657
1,638,912
29-Apr-2014
13:03
Not applicable
Mshtml.dll
8.0.7601.18446
6,041,600
29-Apr-2014
17:14
x86
Mshtml.tlb
8.0.7601.18446
1,638,912
29-Apr-2014
14:01
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:13
Not applicable
Mshtml.dll
8.0.7601.22657
6,041,600
29-Apr-2014
16:20
x86
Mshtml.tlb
8.0.7601.22657
1,638,912
29-Apr-2014
13:38
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:13
Not applicable
Internet Explorer 8 on all supported x64-based versions of Windows 7 and Windows Server 2008 R2
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:14
Not applicable
Mshtml.dll
8.0.7601.18446
9,076,224
29-Apr-2014
17:18
x64
Mshtml.tlb
8.0.7601.18446
1,638,912
29-Apr-2014
14:33
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:14
Not applicable
Mshtml.dll
8.0.7601.22657
9,075,200
29-Apr-2014
18:14
x64
Mshtml.tlb
8.0.7601.22657
1,638,912
29-Apr-2014
15:06
Not applicable
Mshtml.dll
8.0.7601.18446
6,041,600
29-Apr-2014
17:14
x86
Mshtml.tlb
8.0.7601.18446
1,638,912
29-Apr-2014
14:01
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:13
Not applicable
Mshtml.dll
8.0.7601.22657
6,041,600
29-Apr-2014
16:20
x86
Mshtml.tlb
8.0.7601.22657
1,638,912
29-Apr-2014
13:38
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
1,141
29-Apr-2014
08:13
Not applicable
Internet Explorer 9
Internet Explorer 9 on all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
10:36
Not applicable
Mshtml.dll
9.0.8112.16546
12,347,392
29-Apr-2014
10:28
x86
Mshtml.tlb
9.0.8112.16546
2,382,848
29-Apr-2014
10:07
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
10:03
Not applicable
Mshtml.dll
9.0.8112.20657
12,348,416
29-Apr-2014
09:49
x86
Mshtml.tlb
9.0.8112.20657
2,382,848
29-Apr-2014
09:36
Not applicable
Internet Explorer 9 on all supported x64-based versions of Windows 7 and Windows Server 2008 R2
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
11:47
Not applicable
Mshtml.dll
9.0.8112.16546
17,849,344
29-Apr-2014
11:39
x64
Mshtml.tlb
9.0.8112.16546
2,382,848
29-Apr-2014
11:15
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
11:17
Not applicable
Mshtml.dll
9.0.8112.20657
17,850,880
29-Apr-2014
11:09
x64
Mshtml.tlb
9.0.8112.20657
2,382,848
29-Apr-2014
10:41
Not applicable
Mshtml.dll
9.0.8112.16546
12,347,392
29-Apr-2014
10:28
x86
Mshtml.tlb
9.0.8112.16546
2,382,848
29-Apr-2014
10:07
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
10:37
Not applicable
Mshtml.dll
9.0.8112.20657
12,348,416
29-Apr-2014
09:49
x86
Mshtml.tlb
9.0.8112.20657
2,382,848
29-Apr-2014
09:36
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
2,012
29-Apr-2014
10:04
Not applicable
Internet Explorer 10
Internet Explorer 10 on all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:39
Not applicable
Mshtml.dll
10.0.9200.16897
14,357,504
29-Apr-2014
12:47
x86
Mshtml.tlb
10.0.9200.16897
2,706,432
29-Apr-2014
12:25
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:39
Not applicable
Mshtml.dll
10.0.9200.21024
14,379,520
29-Apr-2014
12:56
x86
Mshtml.tlb
10.0.9200.21024
2,706,432
29-Apr-2014
12:33
Not applicable
Internet Explorer 10 on all supported x64-based versions of Windows 7 and Windows Server 2008 R2
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:39
Not applicable
Mshtml.dll
10.0.9200.16897
19,275,264
29-Apr-2014
14:14
x64
Mshtml.tlb
10.0.9200.16897
2,706,432
29-Apr-2014
12:36
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:37
Not applicable
Mshtml.dll
10.0.9200.21024
19,517,440
29-Apr-2014
12:59
x64
Mshtml.tlb
10.0.9200.21024
2,706,432
29-Apr-2014
12:39
Not applicable
Mshtml.dll
10.0.9200.16897
14,357,504
29-Apr-2014
12:47
x86
Mshtml.tlb
10.0.9200.16897
2,706,432
29-Apr-2014
12:25
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:40
Not applicable
Mshtml.dll
10.0.9200.21024
14,379,520
29-Apr-2014
12:56
x86
Mshtml.tlb
10.0.9200.21024
2,706,432
29-Apr-2014
12:33
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:41
Not applicable
Internet Explorer 11
Internet Explorer 11 on all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:48
Not applicable
Mshtml.dll
11.0.9600.17105
17,384,448
29-Apr-2014
12:48
x86
Mshtml.tlb
11.0.9600.17105
2,724,864
29-Apr-2014
12:34
Not applicable
Internet Explorer 11 on all supported x64-based versions of Windows 7 and Windows Server 2008 R2
Windows 8 and Windows Server 2012 file information
Collapse this imageExpand this image
The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following Table:
Collapse this tableExpand this table
Version
Product
Milestone
Service branch
6.2.920 0.16 xxx
Windows 8 and Windows Server 2012
RTM
GDR
6.2.920 0.20 xxx
Windows 8 and Windows Server 2012
RTM
LDR
GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
Note The MANIFEST files (.manifest) and MUM files (.mum) that are installed are not listed.
Internet Explorer 10
Internet Explorer 10 on all supported x86-based versions of Windows 8
Collapse this tableExpand this table
File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:39
Not applicable
Mshtml.dll
10.0.9200.16897
14,357,504
29-Apr-2014
12:47
x86
Mshtml.tlb
10.0.9200.16897
2,706,432
29-Apr-2014
12:25
Not applicable
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
29-Apr-2014
07:39
Not applicable
Mshtml.dll
10.0.9200.21024
14,379,520
29-Apr-2014
12:56
x86
Mshtml.tlb
10.0.9200.21024
2,706,432
29-Apr-2014
12:33
Not applicable
Internet Explorer 10 on all supported x64-based versions of Windows 8 and Windows Server 2012
Windows Windows 8.1 and Windows Server 2012 R2 file information
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Internet Explorer 11
Internet Explorer 11 on all supported x86-based versions of Windows 8.1
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File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
06-Feb-2014
05:40
Not applicable
Mshtml.dll
11.0.9600.17105
17,384,448
29-Apr-2014
12:48
x86
Mshtml.tlb
11.0.9600.16518
2,724,864
06-Feb-2014
10:20
Not applicable
Internet Explorer 11 on all supported x64-based versions of Windows 8.1 and Windows Server 2012 R2
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File name
File version
File size
Date
Time
Platform
Microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
06-Feb-2014
05:41
Not applicable
Mshtml.dll
11.0.9600.17105
23,547,904
29-Apr-2014
14:01
x64
Mshtml.tlb
11.0.9600.16518
2,724,864
06-Feb-2014
11:30
Not applicable
Wow64_microsoft-windows-ie-htmlrendering.ptxml
Not applicable
3,228
06-Feb-2014
05:43
Not applicable
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How to determine whether you are running a 32-bit or a 64-bit edition of Windows
If you are not sure which version of Windows that you are running or whether it is a 32-bit version or 64-bit version, open System Information (Msinfo32.exe), and review the value that is listed for System Type.
To do this, follow these steps:
Click Start, and then click Run, or click Start Search.
Type msinfo32.exe and then press Enter.
In System Information, review the value for System Type.
For 32-bit editions of Windows, the System Type value is x86-based PC.
For 64-bit editions of Windows, the System Type value is x64-based PC.
For more information about how to determine whether you are running a 32-bit or 64-bit edition of Windows, click the following article number to view the article in the Microsoft Knowledge Base: