2 years ago, i created a guide for creating content packs. But it provides impractical and obsolete methods for .mf file extraction. So here's a better guide. 1. You need the Panda3D SDK in order to extract the .mf files. After you installed it, follow one of the 2 methods. Right-click your .mf file/s and select "Extract here". A command prompt window (or windows depending on how many files you want extracted) and do the job. After that, you should see a new folder with the name of the .mf file. Open a command prompt window, navigate to the folder with your .mf file/s with the cd command, and type in "multify.exe -x -f filename.mf". While this method is not obsolete, and it's how you extract .mf files on older versions of Panda3D, it is a bit time-consuming if you want to extract all of TTR's phase files. 2. Do all of your edits and changes. Image: be sure that the image is in the jpg format. Audio: be sure that the track/sound effect is in the ogg format. You can either use a online converter or do it manually in Audacity. 3. Repack the .mf files back. Open command prompt and do the same procedure for extracting, but instead of extracting, type in "multify.exe -c -f filename.mf filename" in order to repack your .mf file. You can type in multiple folder names to repack your folders into one .mf file. ("multify.exe -c -f filename.mf filename filename2") 4. Apply your content pack to TTR. Create a new folder in your TTR installation folder called resources and cut/copy your .mf file/s in there. And that's it. Hope you found this tutorial useful.