One's name is altogether while the other is separate.
Super Mario 64 is a good example of naming differences too the internal rom names for the 2 are MARIOKART64 and SUPER MARIO 64. Perhaps your file name matches the folder but it's actually not the correct rom there's also the chance that the texture pack is only for a specific region rom like it works with (U) but not with (E). It's a really simple tool and you'll just browse to wherever you have the Rom saved then right click the rom info and check the Rom Properties and find the Rom Name. What you can do with that is verify the rom name (not the file name) and that's what the hi-res texture folder name must match. Anyways, a tool I always use when I'm messing with the Hi-res packs is Tool64 (a google search should pull it up as the first result). It was actually some random searching that had brought up your post in one of the results. Hey, I know it's been about 2 months since you had posted and hopefully you've resolved this by now.
