Hi Mike,
For some reason, the first time I saw your message, the file didn't appear, so sorry if you you saw my first answer (now deleted) asking for the file

OK, I analyzed your file with TurboCad and I discovered the main problem--> your original file has a problem with the textures, and for this reason, the original file is corrupted (even with the size)--> for example--> the name 0053_Ivory_skp is used for two textures.
This is what I did--> I removed all the duplicated textures and saved the file as *.3DS (to avoid any problem with the size) --> see attached
You need to import the file and reset the textures
Anyway, Allan's notes regarding the file size are correct

Pat