What's an sd7/sdz file?

A mod is presented as an sd7 or sdz file. This is just a zip file of the individual files comprising the mod.

You can unzip the sd7 or sdz file by renaming it to .zip, and using a zip tool to unzip it.

sd7 / sdz files are created using 7zip.

What is a FBI,BOS,3DO,S3O,GAF,TDF file?

(From http://taspring.clan-sy.com/phpbb/viewtopic.php?t=6015 )

• FBI A text document storing units stats like, name, cost buildtime etc.
• BOS An Uncompiled script written in Pseudo-C
• COB A compiled .BOS file
• 3DO A model format used by ota it is supported by spring
• S3O Spring's own model format.
• HPI A compressed format used by OTA and 3DO builder. GAF files need to be stored here for 3DO builder to read them.
• GP3 Just a renamed .HPI
• GAF 3DO textures are stored within these files
• TDF Used as a generic information file, merely a text document. They can be opened in notepad.

How to create a COB file?

Compile a BOS file using scriptor: [http://www.fileuniverse.com/?p=showitem