Save as scene_pkg.bms :
Originally created by community members (such as those behind the wetranslate.thiscould.work web tool), the unpacker was primarily intended as a recovery tool Scene.pkg Unpacker
You’ll need to reverse the format yourself (common in modding communities): Save as scene_pkg
There are two primary methods for using Scene.pkg Unpacker, depending on the specific version you have obtained. Scene.pkg Unpacker