The wad needs to be ranamed to doomu.wad:
const KnownDooms_t KnownDooms[NUM_KNOWN_DOOMS] =
{
	{ 	"DOOM.WAD",		"Commercial Doom",		3, 9,  registered },
	{	"DOOM2.WAD",	"Doom II",					1, 30, commercial },
	{	"DOOMS.WAD",	"Doom Shareware",			1, 9,  shareware  },
	{	"DOOM1.WAD",	"Doom Shareware",			1, 9,  shareware  },
	{	"DOOMU.WAD",	"Ultimate Doom",			3, 9,  retail     },
	{	"TNT.WAD",		"Doom TNT: Evilution",	1, 30, commercial },
	{	"PLUTONIA.WAD","Doom Plutonia",			3, 9,  commercial }
};
-Craig
www.gbax.com