I'm wondering if you could help with the proper node setup for the textures in blender (assuming you use it). I'm having trouble applying the alpha properly.
If you want the PSX look use the Closest Interpolation on the Diffuse, if you want a N64 look, use the default (i think is linear) Alpha must have Closest in both cases.
I didnt tested the linear interpolation, so maybe it could have some pixel errors.