OK thanks cloud!!!! I'll do that now
@Kashii-Spazz
For my Terrain map that I made in gimp it was 513x513, no layers, greyscale, no masks
For the ground texture in the map maker I used some custom grass from a friend called grass_07 (I deleted it from my exports already)
EDIT: OH THANK YOU CLOUDFISH!!!!!! IT works!
I was able to open FH ^^
Thanks so much guys for your help
PS: Should I put my map stuff back in my exports? (the parts I deleted that belonged to LOST <----the map with the custom terrain)