I am new to Custom DLCs and I have gotten a few to work but I need both files, m.psarc and p.psarc put in the dlc folder on my computer.  How come I only see the p.psarc version for many songs that I find?  Am I doing something wrong here?  Thanks for any tips or help I can get..

The P.psarc is the PC version, M.psarc is the Mac version. Since PC is the most popular format creators tend to just stick with PC files.

So to clarify, you don't need both files, you can remove the m.psarc files, 

Interesting, that makes sense, but the DLCs that I have purchased have given me both files (m and p).  And when I only add a p.psarc the song does not work. I dunno, I will keep trying I guess. 

@@dsmccullough - As was said above, p.sparc files only work on a PC, and m.psarc files only work on a mac (so while the official dlc purchases download both, it's totally unnecessary). Based on what you have said it sounds like you're playing on a mac.

Interesting, that makes sense, but the DLCs that I have purchased have given me both files (m and p).  And when I only add a p.psarc the song does not work. I dunno, I will keep trying I guess. 

Official songs will always have both mac/pc version as there is not differentiation in software.