Steam Versions
Notes on Steam Distribution of XCom Series Games
Take Two's 2K division is the current owner of all the XCom series of games.
The games are available via Valve's Steam service, at http://store.steampowered.com
The cost is $4.99 per game, or the entire collection of 5 games for $14.99.
In the Steam distribution, the XCom executables and game files are found in e.g. "C:\Program Files\Steam\steamapps\common\x-com terror from the deep".
The game files (for TFTD at least) can be edited using standard tools such as TFTD Hack and the command line version of XComUtil. The changes are then picked up in the game.
It is possible to execute the game directly, without using the Steam launcher, by running the "*... patched.exe" version. An error is thrown, but the game does start. This suggests it might be possible to use Seb76's loader, or XComUtil in batch mode - maybe.
The Steam distribution incorporates the "fanmade" F0dder loader.