The $$$ filename, although very enticing, is actually just a standard temporary filename that is used by a number of different software applications and utilities.
The $$ filetype is used as a backup file incase the original file is erased or corrupted in some way. If this happens, the $$$ file can help to restore things to the way they were before the corruption.
.temporary-file File Extension
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What are temporary-file files & how to open them - Temporary File
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