This is the standard "VaM Archive" format. These files are placed in the AddonPackages folder of the software to be loaded into the program. Usage in Virt-A-Mate

Use the specific "morphs" (body and face shapes) included in the .var to create derivative characters.

The prefix typically identifies the creator. Yaneks is a known creator in the VaM community who specializes in high-quality character recreations and stylistic "looks."