streched textures

When I create a model in 3Dstudio and I export it to ASE and read the mapping coordinates, I get a weird result: the texture map becomes stretched.
This could be, because I moved the vertices downwards in 3DS, so the map became stretched.
My question is: is there a possibility in OpenGL to correct the textures, so they aren’t distorted? I mean, could I use somethng like a “spherical map” or anything else to solve this problem?