It could simply be a generic filename for a compressed collection of files (like a "Version 0.73" update) for a specific software or mod.
Could you clarify if you are looking for the and "scary story" behind this file, or if you were trying to find the technical contents of a specific download? V073.rar
In some technical circles, it may refer to a specific version of a resource pack or a set of assets for a game engine (like Unity or Unreal). It could simply be a generic filename for