I downloaded ACE F40PH,<kuid2:162187:3150:1> with error "missing porchtop texture". Right click the kuid and select Edit - Edit in Explorer and find it is missing porchtop. This is a silver colored metal deckplate texture and is missing from this loco. I opened builtin loco Amtrak F40PH 398,<kuid:46162:50404> for Edit in Explorer. Copy the file floor.texture from the body folder and put it into the ACE F40PH, then rename it to porchtop.texture. The file porchtop.texture is equalent to the combination portchtop.tga and porchtop.texture.file. Saved and commit without error, however, it has a yellow ! that states "Warning: The *.texture.txt file is missing for texture resource 'amtrak_f40ph_body/porchtop.texture'". This warning doesn't prevent use of this loco. If you want to clear this warning you have to use PEV's Image2TGA utility which can convert the combination .texture format to the 2 file format.
Bob Weber