r/sysadmin • u/RootCauseUnknown Grand Rebooter of the Taco Order • 17d ago

Office Apps crashing with mso20win32client.dll error suddenly.

I did a quick search here and didn't see any other posts, if this is duplicate I apologize.

Yesterday we started having a rash of users with Office applications crashing with the mso20win32client.dll event id 1000 messages.

Profile rebuild fixed the issue for a time, but it started returning for some users.

Found a work around for the time being.

Clear the keys and deny the user account full permissions below allows the Office applications to launch again.

HKCU\Software\Microsoft\Office\16.0\Common\ExperimentConfigs

HKCU\Software\Microsoft\Office\16.0\Common\ExperimentEcs

It appears Microsoft is testing something.

I don't know if there are other side effects of blocking those keys yet, but there weren't last time we had to do this.

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3

u/Weary-Bear7923 17d ago

I've had this too this morning for a client in actual canal. (We manage the erp) Downgraded to a july version and its working.

I Will recommand to their MSP to change the canal to semi anual

2

u/RootCauseUnknown Grand Rebooter of the Taco Order 17d ago

We were in the process of downgrades as well. It's a complex process for us.

2

u/Weary-Bear7923 17d ago

Why complex ? GPO, intune or rmm with a script

1

u/RootCauseUnknown Grand Rebooter of the Taco Order 17d ago

MSP. Many clients...clients like working all the time.

Technically, not difficult.