Figuring out Doom2 IWAD version?

[Nomad]

Could someone here help me figure out what version my IWAD for Doom 2 is? Evidently I've got some obscure version and need to upgrade.

[rustyslacker]

http://www.olddoom.com/patches/iwadverifier.zip

[Nomad]

Silly thing didn't even recognize my wad. Very peculiar. Oh well.

[Kristian]

This thread (http://forums.newdoom.com/showthread.php?t=21897) should hopefully help (scroll down a bit).