How would I use unpacked assets in Vital Engine?

[Just An Account]

Hello,

I have unpacked Codename Outbreak's main.grp file, and its content (the folders and resource.qrc) are sitting in C:\...\documents\Outbreak. I have changed a few of the sound files, now I can't seem to get them to play. I have tried the following things:
1. Renamed 'Outbreak' in my documents to 'main', and copied it to C:\Games\Outbreak. E.g. now I have 'C:\Games\Outbreak\main\resource.qrc'. This didn't work.
2. After doing step above, I deleted main.grp. It still loaded, but the sounds I modified remained the original, not my new ones.
3. Renamed folder main to main.grp. Didn't work.
4. Copied folders and file from main.grp to Outbreak's main directory. E.g. 'C:\Games\Outbreak\Sounds\'. This also didn't work.

I now have a new install of Codename Outbreak, and main.grp is extracted to my docs again. Any help would be appreciated. I couldn't seem to see anything in GAME.ini that may need changing.

Thanks!