Ok, I am reviving this.
I have discovered some stuff:
1) Graphics are stored in .PAF (Batsmen, Bowlers, Fielders and Umpires), .PGF (I think it is the clothes, hats/glasses and hair), and .TCA (Stadiums and Ball/Bat/Stumps/Sky and the pictures which you see when editing field formations)
2) Textures for the stadiums, pitch, outfield, crowd, menus and even a few fielder/umpire textures are also available in .CAZ format.
3) Commentary is in .CAA format
4) Replays which have been saved (While playing a game, you can save replays you like) are in an odd .REPLAY format. They probably can only be played by the game application.
5) Lineups (I think) are stored in .WCF, .WCS, .WCL and .WCT.
6) Custom fields are stored in .CFF
7) There are 4 files which seem interesting - pitch.wcv, venues.wcv, weather.wcw, extra.wcx. I think these are just the options which are available before you start a game (You can select pitch, weather, venue, match length, etc.)
8) There are several animation files for menus and stuff.
9) Loading screens are in .LBM format
10) Menu screens are in .CAZ
11) Sound effects are in .CAA
12) There is a 'gfx' folder with a variety of files in it(Including .LBM, .SPR and .OFF)
13) There is a 'play_by_play' folder inculding a large number of .CAA files
Any idea on where I can find AI, or does editing the AI involve editing the .EXE (Ala BLIC)??
Also, I am interested in editing the team lineups, but I don't have the foggies how to. Could anyone help?