I haven't been able to get mine to work either. It prompts when I start the game (as expected), the henchman purchase list glitches out (as expected), but my custom ranger doesn't appear in the list.
To minimize issues, I copied your default "ranger.txt" to the directory and renamed to "downfall.lsx" (because someone said that name worked for them). I left the goofy "Default Ranger" name value in there, to make it even more obvious when that character showed up in the list. He didn't show. 
p.s. It has something to do with the guid. I took the existing HenchManData / ID value and incremented the last digit by 1. The custom ranger showed up normally in the list, and I didn't have to monkey with the filename at all. It'd be good to learn the pattern behind that ID at some point, since it'd probably be a "bad thing" [tm] to duplicate an ID for some other necessary game asset.
But, hey, at least it works.
