Although I don't have any specifics from the people who wrote MPC, TYPE has always been a zero (0) in all the MPCPL files I've ever created.
Also, FILENAME is used in all of them as well.
I have a few files that have the LABEL line, but those only appear if the user renamed the file in the playlist while in the program (MPC). For the uses I do, it's not critical unless a filename is rather vague about what it is and I want to clarify it.
The SUBTITLE line I've only noticed a few times, but that one is pretty much required.
Now please keep in mind that knowing WHAT lines to use isn't the problem here. Rather, it's that I have a few rather long playlists for MPC and if it's just one entry, I can easily drag it up or down in the list. But many times, I have numerous lines that I want to move elsewhere in that playlist. And since (A) you can only move one line at a time, and (B) if you try to edit the MPCPL file in a text editor, you have to renumber all the lines so that it all works out in order.
So, in short, knowing what lines to create isn't needed. What *IS* needed is a simple way to move entries in the list around and have it bring any other matching lines with it and then renumber all the lines.
For instance, lets say I wanted to reorganize the list so that it was all MP4's first, then AVI second, and then MP3's last. It would come out like this (if I only copy and paste lines):
4,filename,C:\Users\fdwojo\Videos\Mass Effect Playthrough.mp4
5,filename,C:\Users\fdwojo\Videos\Far Cry Playthrough.mp4
6,filename,D:\Movies\Action Adventure\Indiana Jones #9.mp4
6,subtitle,D:\Movies\Action Adventure\Indiana Jones #9.srt
2,label,Extended Themesong #2
Now, if I did this and tried to play this playlist in MPC, it would actually play in order from #1 to #6. But I had wanted it in a different order, so I'd have had to renumber all the lines so that the first media item was 1, the second was 2, and so on. That's the functionality I'm looking for. It will rearrange the lines, and RENUMBER them into the order I indicate.
Now, in case you're wondering, if you look at the playlist while you are in MPC, it would look like this:
2. Extended Themesong #2
3. Robot [1080p]
4. Mass Effect Playthrough.mp4
5. Far Cry Playthrough.mp4
6. Indiana Jones #9.mp4
Now, imagine this list a lot longer, like maybe a hundred songs and videos. Trying to edit that is tremendously difficult. It all comes down to the fact that each media item in the play list will consist of 2-4 (or more?) lines that make up that one media item. I would need them kept as a group, and moved as a group to whatever new location in the list I'd specifiy.
I hope my description of the problem has helped.