Custom textures stretch?

[Reality]

I've added custom textures to my map, i've done everything correctly. All the .IWI files in .IWD but when i load the map in game, some of the textures are perfect but others are stretched and it ruins the whole map, how can i fix this?

[Rich]

in assman make sure you have tile on. I think you need to use a .dds or a .tga