After some research, it turned out the tool “cacls” that allows one to display or change ACLs (access control lists) can help to reset ACLs.
In Windows 7 it is called “icalcs”. To reset files permissions:
1. Run “cmd” as Administrator
2. Go to the drive or folder in question, for example:
CD /D D:
3. To reset all the files permissions, type:
icacls * /T /Q /C /RESET
4. And that’s it!
After that, the files permissions were reset and I could access them back again.
Update:
It is possible that “icacls” might fail. For that try to take ownership of the files first.
Just before Step (3), please type the following command:
takeown /R /F *
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