Symptoms
Windows Update does not install files on a Windows 10 Technical Preview-based computer that has system compression enabled.
Note On a computer that uses a solid-state drive (SSD) as its boot volume, system compression is enabled automatically.
Cause
When system compression is enabled, the method that file system uses to track file deletions may cause the Windows Update installer to think that the temp files cannot be extracted correctly. This prevents Windows Update from completing.
Resolution
Update information
An update is available to resolve this problem.
How to obtain this update
Windows Update
This update is available from Windows Update.
Prerequisites
There are no prerequisites for installing this update.
Registry information
To apply this update, you do not have to make any changes to the registry.
Restart requirement
You must restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
File information
The global version of this update 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.
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 and MANIFEST files, and the associated security catalog (.cat) files, are extremely 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 32-bit versions of Windows 10 Technical Preview
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Wof.sys | 6.4.9879.9 | 188,448 | 06-Dec-2014 | 07:56 | x86 |
For all supported 64-bit versions of Windows 10 Technical Preview
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Wof.sys | 6.4.9879.9 | 223,776 | 06-Dec-2014 | 09:56 | x64 |
Additional file information
Additional information for all supported 32-bit versions of Windows 10 Technical Preview
| File property | Value |
|---|---|
| File name | X86_18456614258ded6916ed858bab90079d_31bf3856ad364e35_6.4.9879.9_none_c2e643323457388e.manifest |
| File version | Not applicable |
| File size | 693 |
| Date (UTC) | 12-Dec-2014 |
| Time (UTC) | 02:18 |
| File name | X86_microsoft-windows-overlayfilter_31bf3856ad364e35_6.4.9879.9_none_7ede596ed154ad8c.manifest |
| File version | Not applicable |
| File size | 16,851 |
| Date (UTC) | 06-Dec-2014 |
| Time (UTC) | 07:58 |
Additional information for all supported 64-bit versions of Windows 10 Technical Preview
| File property | Value |
|---|---|
| File name | Amd64_ab562181130aa6e7691f126f9f261c70_31bf3856ad364e35_6.4.9879.9_none_33cdc56165b1dcf6.manifest |
| File version | Not applicable |
| File size | 697 |
| Date (UTC) | 12-Dec-2014 |
| Time (UTC) | 02:18 |
| File name | Amd64_microsoft-windows-overlayfilter_31bf3856ad364e35_6.4.9879.9_none_dafcf4f289b21ec2.manifest |
| File version | Not applicable |
| File size | 16,855 |
| Date (UTC) | 06-Dec-2014 |
| Time (UTC) | 10:00 |
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates