This is a file extracted from F*p Night At Frenni's 0.2.7: https://pixeldrain.net/u/7dUvVZyX
I'm sorry, my abilities are limited, and this is all I can do.
When I extract dolls from older games, I get a doll with a huge head in edit mode, but the head is normal size in pose mode. I've tried using "Apply Pose as Rest Pose" in pose mode, but it doesn't seem to work.
Regarding the map import issue in Unity, I have a good idea why it's not working. It's likely because the map file has its textures already packed within the file. Therefore, the solution is to first unpack those embedded textures, and then manually assign each texture to its corresponding part on the map within Unity.