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What is apphelp.dll?

Part of Application Compatibility Client Library by Microsoft

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How is apphelp.dll loaded?

Startup files (all users) run once - apphelp.dll is registered with the run identifier 'KB923561' and the execution command 'rundll32.exe apphelp.dll,ShimFlushCache' in the Windows registry HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce. RunOnce keys are used to launch a service or background process whenever a user logs into Windows. Once the application is launched for the first time its entry will be removed from the Registry so it does not run again when the user logins again. Applications here are designed to be used primarily by Setup programs.
Application Compatibility Client Library is loaded by:


What is the community is seeing?What is the community is doing?
About 0.2% of all Boost users have the apphelp.dll file.Of the 0.2% of apphelp.dll users, 28.0% have disabled it.
Typical file (disk image) location:

What else is related?

What Windows OS versions does this run on?

Microsoft Windows XP (5.1.2600.131072)

About Microsoft Corporation

Microsoft, founded in 1975 by Bill Gates and Paul Allen, is a veteran software company, best known for its Microsoft Windows operating system and the Microsoft More...
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File details

File name: apphelp.dll
Name: Application Compatibility Client Library
Description: Microsoft® Windows® Operating System
Version: 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Product version: 5.1.2600.2180
Size: 124 KB
Original file name: Apphelp

Startup files (all users) run once details

Name: KB923561
Command: rundll32.exe apphelp.dll,ShimFlushCache

Image hashes

MD5: eca24ab73fcffa754d4070cdb03529e3
SHA-1: fea7a16b97f07185d82e2f4f4e23d78f54910452
SHA-256: 65e0b35262ee818919db5a33e13ed91c20c990895eeb728de0dde41ffc18101e

PE image details

File packed: No
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