If you want to distribute sound mods, this should help you

Sound and music pck files are quite big and sound mods distribution is complicated by file sizes.

One of the ways is to create patches.

Warning: this will work only if input file for patch applying is original. This cannot be used on top of already patched files.

There are some tools for patch creation, I personally use xdelta3.

For example, the modded file is External0.pck (voice pack #0)

1. Download xdelta3 from GitHub
2. Use the following command to create a patch: (change paths to yours)

   xdelta3-3.1.0-x86_64.exe -e -s External0-game-original.pck External0-modded.pck External0.patch
   

3. Patch creation is completed. Depending on how much had been changed in the modded file, size of resulting patch will change accordingly.

To apply patch to original file (aka "to apply mod")
You must have unmodded original file

1. Use the following command: (beware of paths and file names)

   xdelta3-3.1.0-x86_64.exe -d -s External0-game-original.pck External0.patch External0-modded.pck
   

2. Rename original External0.pck
3. Rename External0-modded.pck to External0.pck

In some cases patches are really lightweight (< 5 MB)

Files

Alternate File Sources