You need to scan and remove the virus which has renamed the
files
Run Malwarebytes Anti-Malware
Run Superantispyware
Run a complete scan with free curing utility Dr.Web CureIt!
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There is no specific collective noun for folders, in which case
a noun suitable for the situation is used, for example a drawer of
folders, a pack of folders, a box of folders, etc.
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how to change folders from shortcut to normal on flashplayer