PLAYPAL contains fourteen 256 color palettes, used while playing Doom. COLORMAP maps colors in the palette down to darker ones, for areas of less than maximum brightness (quite a few of these places, huh?). ENDOOM is the text message displayed when you exit to DOS. DEMOx x=1-3, are the demos which will play if you just sit and watch. E1M1 etc, to E3M9, along with its 10 subsequent entries, defines the map data for a single level or mission. TEXTURE1 is a list of wall type names used in the SIDEDEF portion of each level , and their composition data, i.e. what wall patches make up each texture. TEXTURE2 contains the walls that are only in the registered version. PNAMES is the list of wall patches, which are referenced by number in the TEXTURE1/2 resources. GENMIDI has the names of every General Midi standard instrument in order from 0-127. Anyone know more...? DMXGUS obviously has to do with Gravis Ultra Sound. It's a text file, easy to read. Just extract it (WadTool works nicely). D_ExMy is the music for episode x level y. D_INTER is the music played on the summary screen between levels. D_INTRO is the 4 second music played when the game starts. D_INTROA is also introductory music. D_VICTOR is the music played on the victory text-screen after an episode. D_BUNNY is music for while a certain rabbit has his story told... DP_xxxxx DP and DS come in pairs and are the sound effects. DP_ are the PC DS_xxxxx speaker sounds, DS_ are the sound card sounds.All the remaining entries in the directory, except the floor textures at the end, and the "separators" like S_START, refer to resources which are pictures, in the doom/wad picture format described in chapter . The floor textures are also pictures, but in a raw format described in chapter .
The next seven are full screen (320 by 200 pixel) pictures:
HELP1 The ad-screen that says Register!, with some screen shots. HELP2 The actual help, all the controls explained. TITLEPIC Maybe this is the title screen? Gee, I dunno... CREDIT The credits, the people at id Software who created this great game. VICTORY2 The screen shown after a victorious end to episode 2. PFUB1 A nice little rabbit minding his own peas and queues... PFUB2 ...maybe a hint of what's waiting in Doom Commercial version. ENDx x=0-6, "THE END" text, with (x) bullet holes. AMMNUMx x=0-9, are the gray digits used in the status bar for ammo count. STxxxxxx are small pictures and text used on the status bar. M_xxxxxx are text messages (yes, in picture format) used in the menus. BRDR_xxx are tiny two pixel wide pictures use to frame the viewing window when it is not full screen. WIxxxxxx are pictures and messages used on the summary screen after the completion of a level. WIMAPx x=0-2, are the summary-screen maps used by each episode. S_START has 0 length and is right before the item/monster "sprite" section. See chapter  for the naming convention used here. S_END is immediately after the last sprite. P_START marks the beginning of the wall patches. P1_START before the first of the shareware wall patches. P1_END after the last of the shareware wall patches. P2_START before the first of the registered wall patches. P2_END before the first of the registered wall patches. P_END marks the end of the wall patches. F_START marks the beginning of the floors. F1_START before the first shareware floor texture. F1_END after the last shareware floor texture. F2_START before the first registered floor texture. F2_END after the last registered floor texture. F_END marks the end of the floors.And that's the end of the directory.
It is possible to include other entries and resources in a wad file, e.g. an entry called CLOWNS could point to a resource that includes the level creator's name, date of completion, or a million other things. None of these non-standard entries will be used by DOOM, nor will they cause it problems. Some of the map editors currently out add extra entries. There is a debate going on right now as to the merits of these extras. Since they are all non-standard, and potentially confusing, for now I'm in favor of not using any extra entries, and instead passing along a text file with a pwad. However, I can see some possible advantages, and I might change my mind...