[Aqua Dark]

Just use MinGW to do all files in a directory so say you have all your files in C:\ToBebzip2 it would find and bzip2 all the files you have in it and will keep the directory structure too.

To use this you'll need MinGW (here) and MSYS (here) If you need help here's the setup and install guild http://www.mingw.org/wiki/InstallationHOWTOforMinGW When installing MinGW make sure you get the bzip2 lib.

Once installed open MSYS run this command

find 'C:\YOUR PATH' -type f -exec bzip2 -9 '{}' \;

So say your files/folders are in C:\bzip2 and you have the folders "models" and "maps" in it. Your path would be C:\bzip2 and it will find all the files and folders inside C:\bzip2 and .bz2 them for you.