First make sure that you copy the entire new directory into the "Program Files\Reflex\Umwelt\Wlp" Directory (I have an addition subdirectory under the Wlp which I call "\New Scenes"
Check the new scene directory and insure that it has a file called
"Sn_1a.bmp" (where n may be "1", "2", or 3" depending on whether the files in the directory are S1, S2, or S3 files) if the file is not there, then look in the other scenes directors till you find the proper Sn_1A file. Just copy this file into the new scenes directory.
Select the new scene with XTR, and let it build the needed files. If you get an error during the file build process, just check the ignore box, and the process should continue.