Was able to restore access to Xactimate by changing Windows11 setting for Windows Security>Apps & Browser Control>Smart Control > OFF.
After software update of Xactimate, unable to open program related to file extension xm8.app.help.dll
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Michael Majure
0
Reputation points
Ran a system update for Xactimate. The program is not starting up. Nothing happen at all. Running Windows 11. Received a windows notification, disappeared before I could capture all details. However, it appears to somehow relate to a permission error on a file extension XM8.APP.HELP.DLL. Please advise.
Windows for home | Windows 11 | Security and privacy
2 answers
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Michael Majure 0 Reputation points
2026-09-17T17:24:09.5633333+00:00 -
David-M 126.8K Reputation points Independent Advisor2026-09-17T17:38:28.5733333+00:00 Thanks for the update.
That makes sense. Smart App Control in Windows 11 blocks untrusted or unverified executable code, including applications and DLLs, that lacks an established reputation in the cloud. This behavior is often triggered following software updates that introduce new files to the system.
Thanks for sharing the solution you found for your case.
Best regards.
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David-M 126.8K Reputation points Independent Advisor
2026-09-17T17:16:39.73+00:00 Hi. I'm David, and I'm happy to help you.
This issue sounds like Windows Ransomware Protection (Controlled Folder Access) is blocking Xactimate from writing or registering files during an update.
Open "Windows Security > Virus & threat protection > Protection history". Look specifically for an entry stating "Controlled folder access blocked". If you find anything, can you send a screenshot? Use the shortcut "Windows + Shift + S" to use the screenshot tool.
Could you also share your Xactimate installation directory (e.g.,
C:\Program Files\...)?If you have a third-party antivirus, can you tell me which one?
Looking forward to your reply.
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Michael Majure 0 Reputation points
2026-09-17T17:25:17.5466667+00:00 Did not have a listing as suggested under the Windows Security > Virus & threat protection > Protection history, in this case.
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