The *.inv file extension is related to the Rainbow Six: Rogue Spear computer games and used for its inventory files.
INV file extension - Rainbow Six Rogue Spear inventory file
What is inv file? How to open inv files?
File type specification:
The INV file extension is associated with the Rainbow Six Rogue Spear computer game.
Rainbow Six: Rogue Spear is a tactical first-person shooter computer game developed and published by Red Storm Entertainment. It is the sequel to the critically acclaimed Rainbow Six game based on the Tom Clancy novel of the same name. Published in 1999.