Speak clearly and tell us what you want to do.
1. RoC, true it does not have a import manager but you can still import files to your map via MPQ tools, such as WinMPQ. I'd recommend TFT's import manager.
We'd open your map with WinMPQ add a file into and easily add its path.
2. TFT, does have a import manager and it is fully functional. Skins all need is a path and imported into the map, and their work is done. The import manager will not reject ANY file imported. They just need to be in .blp.