I tried using jorde's Stalin Leaderhead (and the other World War II leaderheads in his collection) but when it loads, it says "File not found: 'Stalin Ancient - Foreward.flc.' The game will now exit." I put the leaderheads into the Art folder of the Scenario name, deleted the Scenario File which had the same name as the one with more content, and I put the name of my scenario file into the Scenario Search Folders! What is going on?

Did you add the spaces?
I found renaming all of his files to like STAF, shorting all of them to abbreviations without spaces really helps.

Did you check for spelling errors i.e. "forward" instead of "foreward"?

The file was apparently spelt "forward".

I have added the head to one of my mods and I have had no problem with it. When you added did you spell it right in the map editor. I find that is where I usually make problems.

Apparently, I did: in the files, "Foreward" is spelt "Forward". In the map editor, I spelt it correctly.