As the name suggests, this is a reupload of the resources for the M4's assets I uploaded before the archive deletion. Hope this still helps fellow modders. Enjoy everyone. EVERYTHING is here.

How I work with the nm files.
1: Use a DDS Viewer program, the one I use is here https://amnoid.de/ddsview/index.html. I use this one as it can save the files as psd files that are easy to open. I dont like to use GIMP.

2: When you open it, it will be in greyscale, with only Red and Alpha channels being used. Copy Red to the Green channel, copy the Alpha to Red, and then use the fill tool to paint the Blue channel white. It should look like a normal map from many Source engine games.

3: Do what you want to the normal map. When you finish, copy the new Red channel to Alpha, and copy the new Green channel to the Blue and Red channels, it will be greyscale again and be finished.