The Official RTS FAQ ver 1.3 - HTML Version
rtsfaq13.txt - date: 1/12/97 - 18,654 bytes.
rtsfaq13.zip - date: 1/125/97 - 6,457 bytes.
The official RTS FAQ by Charlie Wiederhold is available via three methods. You can view the HTMLized version, or download the text version. The text is available both zipped and unzipped.

rtshelp.zip - date: 12/15/96 - 7,309 bytes.
RTSHELP.ZIP is a small program written by Apogee/3D Realms to offer some help in regards to RTS files. It explains to you in a little more depth how to use RTSMAKER.EXE and RTS files.

Usenet newsgroups:

alt.binaries.games
alt.binaries.games.discussion
alt.games
alt.games.apogee
alt.games.duke3d
alt.games.duke3d.binaries
alt.games.ibmpc
comp.sys.ibm.pc.games
comp.sys.ibm.pc.games.action
comp.sys.ibm.pc.games.announce
comp.sys.ibm.pc.games.misc
rec.games.misc