The Fc.exe command does not work correctly in Windows Vista or in Windows Server 2008 when the command compares files that differ at every 128th byte of a character string

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Article ID: 953931 - View products that this article applies to.
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SYMPTOMS

On a computer that is running Windows Vista or Windows Server 2008, you use the Fc.exe command to compare two files. If the two files both contain a character string that has more than 128 bytes, the Fc.exe command may not check the character at every multiple of 128. Therefore, when you use the Fc.exe command to compare the files that differ only at the 128th byte, the 256th byte, the 384th byte, and so on, the Fc.exe command will find no differences. This result is incorrect.

For example, assume that you have two files that contain a character string of 200 bytes. Also assume that only the character at the 128th byte differs from one file to the other. When you use the Fc.exe command to compare the two files, the command does not display the differences between the two files, and you receive the following output:
Comparing files FileName1 and FileName2
FC: no differences encountered

RESOLUTION

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

No prerequisites are required.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Vista and Windows Server 2008 file information notes
  • The files that apply to a specific product, milestone (RTM, SPn) can be identified by examining the file version numbers as shown in the following table:
    Collapse this tableExpand this table
    VersionProductMilestoneService branch
    6.0.600 0. 20 xxx Windows RTM LDR
    6.0.600 1. 22 xxx Windows Vista SP1 and Windows Server 2008 SP1 SP1 LDR
  • Service Pack 1 is integrated into Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
  • The MANIFEST files (.manifest) and MUM files (.mum) installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ifsutil.dll6.0.6000.20851121,85605-Jun-200804:44x86
Ulib.dll6.0.6000.2085199,32805-Jun-200804:47x86
Ifsutil.dll6.0.6001.22196123,39205-Jun-200804:46x86
Ulib.dll6.0.6001.2219699,84005-Jun-200804:49x86
For all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ifsutil.dll6.0.6000.20851144,89605-Jun-200804:58x64
Ulib.dll6.0.6000.20851128,00005-Jun-200805:02x64
Ifsutil.dll6.0.6001.22196146,94405-Jun-200805:14x64
Ulib.dll6.0.6001.22196128,00005-Jun-200805:19x64
For all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ifsutil.dll6.0.6001.22196370,17605-Jun-200804:52IA-64
Ulib.dll6.0.6001.22196294,40005-Jun-200804:56IA-64

Additional file information for Windows Server 2008 and Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File namePackage_1_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,794
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_2_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,961
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_3_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,799
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_4_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,799
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_5_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,799
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_6_for_kb953931~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,795
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,426
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client_1~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,367
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,713
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_sc_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,421
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_sc~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,423
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_server_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,425
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_server~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,431
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpesrv_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,422
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpesrv~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpe_0~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,420
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpe~31bf3856ad364e35~x86~~6.0.1.0.mum
File versionNot Applicable
File size1,424
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameX86_7892dc0dcca394ff58d26e59dec7357e_31bf3856ad364e35_6.0.6000.20851_none_7920ec7b3c838886.manifest
File versionNot Applicable
File size714
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameX86_b43716d5ab0476e4728905426556ab12_31bf3856ad364e35_6.0.6001.22196_none_e31db214948c7632.manifest
File versionNot Applicable
File size714
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameX86_microsoft-windows-f..temutilitylibraries_31bf3856ad364e35_6.0.6000.20851_none_e804a8910bcc0aa4.manifest
File versionNot Applicable
File size6,219
Date (UTC)05-Jun-2008
Time (UTC)05:13
File nameX86_microsoft-windows-f..temutilitylibraries_31bf3856ad364e35_6.0.6001.22196_none_e9c4a713090e8ce5.manifest
File versionNot Applicable
File size6,219
Date (UTC)05-Jun-2008
Time (UTC)05:42
Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista
Collapse this tableExpand this table
File nameAmd64_04eca7cb94bc3ce096642c9915b415d2_31bf3856ad364e35_6.0.6001.22196_none_5a959bc800bd0da2.manifest
File versionNot Applicable
File size1,076
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameAmd64_b3b432686dda2aaafd71e58c3da6198a_31bf3856ad364e35_6.0.6001.22196_none_ee8a543b0cfc4fb6.manifest
File versionNot Applicable
File size718
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameAmd64_b819c873849d4b90ffca3b1413969e10_31bf3856ad364e35_6.0.6000.20851_none_11b2c324e098759e.manifest
File versionNot Applicable
File size718
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameAmd64_fd871fd9890804e39d644ee321557dc4_31bf3856ad364e35_6.0.6000.20851_none_0a2ff590274dbbe0.manifest
File versionNot Applicable
File size1,076
Date (UTC)05-Jun-2008
Time (UTC)18:23
File nameAmd64_microsoft-windows-f..temutilitylibraries_31bf3856ad364e35_6.0.6000.20851_none_44234414c4297bda.manifest
File versionNot Applicable
File size6,237
Date (UTC)05-Jun-2008
Time (UTC)05:58
File nameAmd64_microsoft-windows-f..temutilitylibraries_31bf3856ad364e35_6.0.6001.22196_none_45e34296c16bfe1b.manifest
File versionNot Applicable
File size6,237
Date (UTC)05-Jun-2008
Time (UTC)08:47
File namePackage_1_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,804
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_2_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,205
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_3_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,041
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_4_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,041
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_5_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size2,041
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_6_for_kb953931~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,805
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,434
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client_1~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,375
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_client~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,723
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_sc_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,429
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_sc~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,431
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_server_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,433
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_server~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,439
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpesrv_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,430
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpesrv~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,438
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpe_0~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,428
Date (UTC)05-Jun-2008
Time (UTC)18:23
File namePackage_for_kb953931_winpe~31bf3856ad364e35~amd64~~6.0.1.0.mum
File versionNot Applicable
File size1,432
Date (UTC)05-Jun-2008
Time (UTC)18:23
Additional files for all supported IA-64-based versions of Windows Server 2008
Collapse this tableExpand this table
File nameIfsutil.dll
File version6.0.6001.22196
File size370,176
Date (UTC)05-Jun-2008
Time (UTC)04:52
File nameUlib.dll
File version6.0.6001.22196
File size294,400
Date (UTC)05-Jun-2008
Time (UTC)04:56

WORKAROUND

To work around this problem, run the Fc.exe command together with the /b (binary) switch.

Note Binary mode does not show the location of the differences.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Fc.exe is a command that compares two files or two sets of files, and then it displays the differences between them.

Properties

Article ID: 953931 - Last Review: October 8, 2011 - Revision: 2.0
APPLIES TO
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Ultimate
  • Windows Vista Business 64-bit Edition
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 for Itanium-Based Systems
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows Web Server 2008
Keywords: 
kbautohotfix kbexpertiseinter kbbug kbfix kbqfe KB953931

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