Symptoms
Users can't open any published app, error This program is blocked by group policy is thrown:

Cause
Security settings on RDS hosts or Remote PCs prohibit the launching of C:\Windows\System32\memshell.exe
Memshell.exe is the component of Parallels Remote Application Server responsible for starting published resources.
Resolution
Please configure Group Policy or other security technology (i.e., Applocker) being used
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