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A user is getting an intermittent error “Cannot create file “C:…\Filename.ini”. The requested operation cannot be performed on a file with a user-mapped section open.”
I haven’t been able to find much about this error that helps understand what’s going on.
Is TMemIniFile thread-safe?
As far as I know TMemIniFile (and any other TCustomIniFile descendants) is not thread-safe. You will need to wrap it into a critical section.
In this link you can find an implementation of a thread-safe TCustomIniFile (theoretically programmed by Peter Below of TeamB though I can not assure it).
There is also a discussion in the Embarcadero forums about the thread-safety of TMemIniFile here. They speak about the C++ version of the component.
You can also find a discussion in MSDN regarding the origin of your error message here. It is a bit long but the general conclussion is that there are 2 exes trying to acces the same file. You can find another discussion on the subject here.