The quest for a is fraught with danger but not impossible. Your safest path is to:
Bigfile.000.tiger is a perfect example of how modern gaming works. To the player, the game is a seamless world. To the computer, it's a puzzle of split archives and compressed data, locked inside a proprietary "Tiger" cage.
For old Mac OS X Tiger applications, use or SheepShaver to run the original OS, then copy the file from within the emulator.