App Control policy block


G

goodlad

Member
Local time
9:36 AM
Posts
34
OS
Windows 11 x64 25H2
hi guys,

Looks like MPC player is having issues in my system, haven't ran in a while but when I tried to run today, first got "Smart App Control" blocked it.
So, tried running update from codecguide & now I can't run the exe file, says Error 4551: An application control has blocked the file.

Anyone got tips to overcome this mess? Never had any issues with MPC player before.
 

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Windows 11 x64 25H2AMD Ryzen 5 Mobile 4600H16GB
OS
Windows 11 x64 25H2
Computer type
Laptop
Manufacturer/Model
Lenovo IdeaPad Gaming3 15ARH05D
CPU
AMD Ryzen 5 Mobile 4600H
Memory
16GB
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Firefox, Chrome, Edge, Vivaldi, Brave
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BitDefender Total Security
Whilst you can disable SAC, there's no granular control (whitelist). If disabled, for now, you would e.g. have to reinstall Windows to reenable it. A workaround was posted here:

Smart App Control

Today I looked on my computer but couldn't find the maintenance batch script that antspants created as a zip file on Oct 14, 2025. (see the General Support forum / System Maintenance thread.) So, I downloaded it. But Windows wouldn't let me run the batch file because it said that such programs...
www.elevenforum.com www.elevenforum.com

- and MS is said to be adding the ability to turn it off and on again this year.
This you can find if you search the forum for
Smart App Control

More:
www.elevenforum.com

Turn On or Off Smart App Control in Windows 11

This tutorial will show you how to manually turn on or off Smart App Control in Windows 11. Smart App Control (SAC) is a new security feature starting with Windows 11 build 22567. Smart App Control can work alongside your other security software, such as Microsoft Defender, for added...
www.elevenforum.com www.elevenforum.com

Increasingly aggressive Smart App Control

Over the past week or so I find more and more apps being blocked by Smart App Control (Win11 Pro 25H2). I'll post a screen shot of the two most recent ones from today. I ran a winget update which updated ImageGlass and now it's blocked. It seems unwise to turn off Smart App Control, but it's...
www.elevenforum.com www.elevenforum.com

Smart App Control - Turned itself on but Send Optional Diagnostic Data is off

Earlier this morning when I was playing a game Smart App Control switched from Evaluation mode to On. I've just recently upgraded from 10 to 11 and looked into this feature, but it seems that it requires optional diagnostic Data to be on for it to switch on, what gives? Has Microsoft changed...
www.elevenforum.com www.elevenforum.com
 

My Computer My Computer

At a glance

Windows 11 Proi7-8650U16GBIntel UHD 620
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Windows 11 Pro
Computer type
Laptop
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Lenovo t480s
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i7-8650U
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16GB
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Intel UHD 620
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C SN810 SDCPNRY-512G-1006
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Defender
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