The D3DQuakeSrc.zip file you have requested: Tools and Utilities / Source Code for version v0.5 - 2.64mb is not available. Perhaps try browsing all files for the game Quake and upload any files you want to share or are missing. This is the only information we could locate:
NEW NOTE FOR 1.08:
Joysticks are disabled by defualt now, due to problems on some systems without joysticks installed. Type "joystick 1" at the console, and everything will behave as documented here. This will be saved in your config file, s D3DQuake is a modification of the id Software GLQuake version of the Quake 1.09 engine. D3DQuake is just GLQuake modified to use Direct3D 7.0 instead of OpenGL.