The Q3Ashader_manual.zip file you have requested: Tools and Utilities / Tools / Q3A Shader Manual - 851.59kb is not available. Perhaps try browsing all files for the game Quake III Arena and upload any files you want to share or are missing. This is the only information we could locate:
Yes, Q3A map and model makers, here's the Christmas present that Santa's elves hadn't quite finished yet. It's in the format of an MS word document and has some graphics nested in it, so it's a little large.