Prerequisites:
- RAD Tools (modern version)
- RAD Tools 1.0 (webarchive link, install to different folder)
- XCC Mixer
- FFmpeg

Instructions:
1. Run XCC Mixer.exe
- Open movies01.mix
- Extract the .bik files to a new folder (for example, "bik_originals_movies01").
- Inside that folder, create a subfolder (for example, "mp4_files").

2. Open command prompt
- Navigate to newly created "bik_originals_movies01" folder (using "cd" command).
- Execute following command: 
for %i in (*.bik) do "PATH_TO_FFMPEG\ffmpeg.exe" -i "%i" -vf scale=-2:1080,setsar=1:1 -b:v 15000k -map 0:v "mp4_files\%~ni.mp4"

This will re-encode the videos to 1080p at 15M bitrate, with no audio. At this point you can do whatever you want actually (AI upscale, etc). In the end, you should end up with a bunch of MP4 files.

3. Run modern version of RAD Tools (radvideo64.exe)
- Navigate to newly created "mp4_files" folder.
- Select all MP4 files and click "Bink it!".
- Select "Yes" in "You have selected multiple files" message prompt.
- Set "Compress to a % of the original" to 27 (this will compress to roughly 4M bitrate, the other compression methods don't seem to work for whatever reason).
- Set "Output directory info" to a new folder (for example, "bik_modified_movies01").
- Here's an example of the settings: screenshot.
- Click "Batch" button.
After it's done, you will have a bunch of BIK files, at higher resolution, but with no audio. This is fine.

4. Run outdated version of RAD Tools (radvideo.exe)
- Navigate to folder with finalized BIK movies (in our case it's "bik_modified_movies01").
- Select first file and click "Mix in sound".
- If you get a prompt with something about a sequence, select "No".
- Set "Sound file to mix" to "\bik_originals_movies01\YOUR_MOVIE.bik" -- select the original file.
- Inside "Output file info" remove the "New_" prefix.
- Check "Automatic overwrite?".
- Set "Sound compression level" to 0.
- Here's an example of the settings: screenshot.
- Click "Mix". Repeat this for every BIK video.

The reason we're messing with old version of RAD is because newer versions are using a different audio compression algorithm (DCT instead of RDFT), which results in muted audio when playing back in the game. However, the old version cannot read MP4 containers. So processing the videos in this order ensures we get the best of both worlds.

5. Run XCC Mixer.exe again
- Open movies01.mix
- Drag-and-drop your finalized BIK files (in our case they'll be in "bik_modified_movies01" folder) into the package.
- Close the program. No need to save or confirm anything, it has already packed the files on the fly.