I would like to add one point to maclean's explanation of MAT files. When you setup a texture map for a character in the PC version of Poser 4, Poser saves the texture refrence as an absolute path in Windows format, like this: textureMap "C:Poser 4RuntimeTexturesMy FolderP4 woman texture3-1200.tif" This works fine on YUOR computer, but the path to the file might be diffrent on someone elses computer. For this reason it is better to use just the file name preceeded by a colon (:) and enclosed in double quotes like this: textureMap ":P4 woman texture3-1200.tif" When no path is given Poser looks in the textures folder and all its sub-folders so it will finde a file listed in this format, but it may not find a file with an incorrect absolute path.