Application Compatibility Cache (ahcache) Service Defaults in Windows 10

Cache Compatibility Data and Attributes for Individual PE File.

Default Settings

Startup type:System
Display name:Application Compatibility Cache
Service name:ahcache
Service type:kernel
Error control:normal
Path:%SystemRoot%\system32\DRIVERS\ahcache.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ahcache

Default Behavior

Application Compatibility Cache is a kernel device driver. In Windows 10 it is starting at Kernel initialization. If Application Compatibility Cache fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the ahcache service has failed to start due to the error.

Restore Default Startup Configuration for Application Compatibility Cache

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config ahcache start= system
sc start ahcache

3. Close the command window and restart the computer.

The ahcache service is using the ahcache.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.