What else can I do to solve the problems with the $$F file?

The reasons for the lack of the ability to open a $$F file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a $$F file. If there is still something wrong, you might want to check:

.$$F file extension
  • whether the $$F file is not damaged
  • whether the file is not incorrectly linked in the registry entries
  • whether the installation of an application that supports the given file format is complete
  • whether the file is not infected
  • whether the drivers of the equipment used for opening a file are up to date
  • whether your computer has enough parameter/hardware resources to open a file with the given extension
  • whether the extension has not been accidentally removed from the Windows registry

Is the $$F file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.