[General] Warcraft file extensions

[bajaist]

I thought about making small autosave/checkpoints system, and i've noticed that saved files have .w3p, .w3v or .w3z extensions. As i understood first two are for campaigns, and third is for single map or multiplayer, true? What's the difference?

And, in general, what do other extensions stand for?

Edit:

Solving:

• .w3v - Gamecache
• .w3p - Campaign progress record
• .w3z - Savegame