How to obtain this update or hotfix
To resolve this issue, we have released an update through Windows Update and Microsoft Download Center. We also have released a hotfix for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2.
Important Do not install a language pack after you install this update or hotfix. If you do, the language-specific changes in the update or hotfix will not be applied, and you will have to reinstall the update or hotfix. For more information, see Add language packs to Windows.Method 1: Windows Update
This update is available from
Windows Update.
Method 2: Microsoft Download Center
The following files are available for download from the Microsoft Download Center:
Note The update for Windows RT 8.1 can be obtained only from Windows Update.
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Method 3: Hotfix package for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2
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.
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, submit a request to 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 website: 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.Update or hotfix detail information
Prerequisites
To apply this update or hotfix, you must have
April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2.
Registry information
To use the update or hotfix in this package, you do not have to make any changes to the registry.
Restart requirement
You may have to restart the computer after you apply this update or hotfix.
Update or hotfix replacement information
This update or hotfix does not replace a previously released update or hotfix.
File information
The global version of this update or hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 8.1 and Windows Server 2012 R2 file information and notes
- 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:
| Version | Product | Milestone | Service branch |
|---|
| 6.3.960 0.17 xxx | Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 | RTM | GDR |
- The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 8.1
| File name | File version | File size | Date | Time | Platform |
|---|
| Udfs.sys | 6.3.9600.17670 | 260,096 | 30-Jan-2015 | 02:26 | x86 |
For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2
| File name | File version | File size | Date | Time | Platform |
|---|
| Udfs.sys | 6.3.9600.17670 | 316,416 | 30-Jan-2015 | 03:02 | x64 |
For all supported Windows RT 8.1
| File name | File version | File size | Date | Time | Platform |
|---|
| Udfs.sys | 6.3.9600.17670 | 235,008 | 30-Jan-2015 | 01:44 | Not applicable |
Additional file information
Additional file information for Windows 8.1 and for Windows Server 2012 R2
Additional files for all supported x86-based versions of Windows 8.1
| File property | Value |
|---|
| File name | X86_ae08ee89c139c7ebcb4b5ea3f780c031_31bf3856ad364e35_6.3.9600.17673_none_bcd76f5e8fb796b8.manifest |
| File version | Not applicable |
| File size | 692 |
| Date (UTC) | 05-Feb-2015 |
| Time (UTC) | 20:21 |
| Platform | Not applicable |
| File name | X86_microsoft-windows-udfs_31bf3856ad364e35_6.3.9600.17673_none_3b231b56387621f0.manifest |
| File version | Not applicable |
| File size | 4,694 |
| Date (UTC) | 04-Feb-2015 |
| Time (UTC) | 03:51 |
| Platform | Not applicable |
Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2
| File property | Value |
|---|
| File name | Amd64_55511e03fe09b9b97b39d8affd81e0c4_31bf3856ad364e35_6.3.9600.17673_none_5ea1d9b4c671223b.manifest |
| File version | Not applicable |
| File size | 696 |
| Date (UTC) | 05-Feb-2015 |
| Time (UTC) | 20:21 |
| Platform | Not applicable |
| File name | Amd64_microsoft-windows-udfs_31bf3856ad364e35_6.3.9600.17673_none_9741b6d9f0d39326.manifest |
| File version | Not applicable |
| File size | 4,696 |
| Date (UTC) | 04-Feb-2015 |
| Time (UTC) | 17:40 |
| Platform | Not applicable |
Additional files for all supported Windows RT 8.1
| File property | Value |
|---|
| File name | Arm_18522c3d309d97a5ae24b198c0fd5475_31bf3856ad364e35_6.3.9600.17673_none_0e77e4839c51224f.manifest |
| File version | Not applicable |
| File size | 692 |
| Date (UTC) | 05-Feb-2015 |
| Time (UTC) | 20:21 |
| Platform | Not applicable |
| File name | Arm_microsoft-windows-udfs_31bf3856ad364e35_6.3.9600.17673_none_3b258dae387340b6.manifest |
| File version | Not applicable |
| File size | 4,694 |
| Date (UTC) | 04-Feb-2015 |
| Time (UTC) | 17:59 |
| Platform | Not applicable |
