In general, .rar files are compressed archives used to bundle multiple files together. If you encountered this specific filename in a story or online forum, it is likely one of the following:
: Many internet horror stories (creepypastas) revolve around mysterious files or "cursed" downloads. If this is from a specific piece of fiction, it may be a unique element created by that author. Candy Cane120.rar
There is no widely recognized "useful story" or viral context associated with a file named . In general,