I found an old thread made by @Sduibek (and with helpful input from @.Pixote. , @Darek , @Nirran ) about how to make the BIS Mapper being able to open Fallout 1 maps. I followed the instructions on the thread, getting the software needed and a couple days invested in this, I finally made it work. The Mapper opens and I can choose the maps I want to open. Unfortunately, I must be still missing something. Because most maps will not open and instead give one of two errors (one crashes the mapper, the other just doesn't load the map), others will just freeze-crash the mapper. Here are the two errors. Mapper Crash: Map not loading: By the error messages, it seems like I have something wrong with "objects" in my setup. Anyone has any input or help? I don't really want to edit or make maps, I just want to be able to access FO1 maps. Thanks for reading.