This is a clever approach that hides the natural extension even if the user has disabled Windows’ extension concealing feature.
This is how an executable looks after changing its extension to “pif”—not only is the extension hidden, but the original icon is as well. For example, “file.txt.pif” is the full name of the supplied file. The file can still be opened and executed because of the PIF extension. Users may deploy the extension by double-clicking.
To avoid falling victim to the double extension scam, go to Control Panel > Folder Options > View tab and deactivate the “Hide extensions for known file types” option.