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+There are at least 3 versions of Rise of the Triad that are supported
+by rottexpr. Each game version uses a different game binary, but there's a
+wrapper script that looks at the available game data files and runs the
+"best" version of the game (this is what happens if you just run "rottexpr",
+or run Rise of the Triad from the KDE/XFCE application menu). The game
+looks for the data files in /usr/share/games/rottexpr, and the different
+versions can coexist. All filenames must be UPPERCASE.
+
+Which version do I have?
+------------------------
+If you've got an installed copy of the game, maybe on a DOS/Windows partition,
+here's how to identify it:
+
+- If you have no files named DARKWAR.*, you have the shareware/demo
+version.
+
+- If you have DARKWAR.(WAD|RTL|RTC), but no ROTTCD.RTC, you have the
+registered floppy/download version.
+
+- If you have ROTTCD.RTC (and DARKWAR.*), you have the CD-ROM version.
+---
+
+Shareware/Demo version 1.3
+--------------------------
+Data files: HUNTBGIN.WAD HUNTBGIN.RTC HUNTBGIN.RTL REMOTE1.RTS
+
+This is always included in the package.
+
+The binary for the shareware version is called "rottexpr-demo".
+---
+
+Registered (Floppy Disk, Registered Download) version 1.3
+---------------------------------------------------------
+Data files: DARKWAR.WAD DARKWAR.RTC DARKWAR.RTL REMOTE1.RTS
+
+Copy these files from your DOS/Windows ROTT game directory to
+/usr/share/games/rottexpr/, making sure to give them all-uppercase names.
+If the shareware REMOTE1.RTS is already there, it doesn't matter whether
+you overwrite it or not (this file is identical in the demo and registered
+versions).
+
+If you have an older version than 1.3, see http://www.3drealms.com/rott/
+for a patch.
+
+The binary for the registered version is called "rottexpr-reg".
+---
+
+CD-ROM version 1.3
+------------------
+Data files: DARKWAR.WAD ROTTCD.RTC DARKWAR.RTL REMOTE1.RTS
+
+Copy these files from your Rise of the Triad CD-ROM to
+/usr/share/games/rottexpr/, making sure to give them all-uppercase names.
+On my CD, there are two copies of the files (in the rottplay/ and
+rottinst/ subdirectories). The REMOTE1.RTS is identical to the
+one from the shareware and registered versions.
+
+The binary for the CD-ROM version is called "rottexpr-cdrom". (The CD doesn't
+have to be in the drive to play the game, though)
+
+This version of the game is identical to the registered version except
+that it uses a different set of levels for multiplayer games.
+
+If you have an older version than 1.3, see http://www.3drealms.com/rott/
+for a patch.
+---
+
+Data File MD5 sums
+------------------
+2823fe5baa07fa2a5a05df3af0cf8265  DARKWAR.RTC
+d1f44aa4d1cb230ba6c3694acc09b6b7  DARKWAR.RTL
+2ec4b19372d1ae55d01058f772f6214f  DARKWAR.WAD
+4d90dec2da07a8eee1162efd3e23d98d  HUNTBGIN.RTC
+b9b0a3be46a4f7fccabb1c1e8cf5455f  HUNTBGIN.RTL
+37793500e3b1de2125a98604b69838e3  HUNTBGIN.WAD
+190c69835af502e4d8f08ee733c3fcc5  REMOTE1.RTS
+64c8e7123a7edcb7b8739b42cdae0120  ROTTCD.RTC
+
+These md5sums are for the 1.3 shareware and CD-ROM versions of the game
+(the files the SlackBuild author used for testing). If yours don't match,
+they might be for an older version of the game, or they might be corrupt
+(try them and see).
+---
+
+Wrapper Script (/usr/games/rottexpr)
+--------------------------------
+If you run "rottexpr" from the command line, or launch it from the KDE/XFCE
+application menu, this script looks in /usr/share/games/rottexpr to see which
+set of data files you have, and runs the correct game binary for you.
+
+If the script finds ROTTCD.RTC, it runs rottexpr-cdrom
+Otherwise, if it finds DARKWAR.WAD, it runs rottexpr-reg
+Otherwise, if it finds HUNTBGIN.WAD, it runs rottexpr-demo
+If none of the above exist, it exits with an error.
+
+If you have the correct data files, you can always run rottexpr-demo,
+rottexpr-reg, or rottexpr-cdrom directly, to choose which version of the game
+to play. You probably should always do this for multiplayer games,
+since all players need to be running the same version of the game.
+---
+
+Add-on Levels
+-------------
+Add-on level packs require the registered or CD-ROM version of the game.
+To load them, use the "file", "filertl", and/or "filertc" options. Unlike
+the main game data files, add-on files are searched for in the current
+directory (or you can give the full path).
+
+Example: to play the ROTT Reject Level Pack, download and unzip it, then
+run:
+
+$ rottexpr filertc REJECTS.RTC
+
+...and then start up comm-bat mode.
+
+RTL files are single-player levels and RTC files are for comm-bat
+(multiplayer). Remember that comm-bat mode doesn't really work in this
+port of ROTT (no networking code, so all you can do is run around by
+yourself).
+---