MS Quick Assist crashes when used in Citrix session

MS Quick Assist crashes when used in Citrix session

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Article ID: CTX463527

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Updated On:

Description

MS Quick Assist is crashing when trying to shadow the Citrix session.
Application crash with Exception Code: c06d007e (ERROR_MOD_NOT_FOUND The specified module could not be found.)
 

Environment

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Resolution

Upgrade the VDA version to 2203 CU3 LTSR or to 2305 depending on whether you are using an LTSR release or a Current Release version. A fix has been implemented to remove the dependency on Picaddapi64.dll (CVADHELP-20383)

Where an upgrade is not currently possible, Copying picaddapi64.dll to C:\Windows\System32 on the VDA may work as a temporary workaround. This file is normally located in C:\Program Files (x86)\Citrix\HDX\bin\.

Problem Cause

In some of UWP apps - in this case MS Quick Assist, picaddapi64.dll fails to load due to sandbox mechanism UWP apps use.

File access permissions for UWP applications: https://docs.microsoft.com/en-us/windows/uwp/files/file-access-permissions

In example of Quick Assist: QuickAssist.exe is getting an exception while cxinjime64.dll is calling HookGetKeyboardType(). 
Picaddapi64.dll is not loaded because its path ("C:\Program Files (x86)\Citrix\HDX\bin\") is not allowed to be accessed by the application.

Additional Information

Microsoft UWP File Access Permissions: https://learn.microsoft.com/en-us/windows/uwp/files/file-access-permissions
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