Hi Andy,
Open the file in a text editor and go to line 6500. You will probably find that there is a non-English letter, most likely something with an accent. Chances are it's in something like a file path. Change that letter to something else and save it. It will probably open although the change may mean a file, perhaps object or image, won't load.
If you like you can email me the file at:
jomeder@planetside.co.uk
and I'll see if I can fix it.
Regards,
Jo