Cannot open file: Unexpected error when detecting file type for file C:\ (...) hexadecimal value 0x00, is an invalid character, Line 80547, position 10

Hi, I get this message when trying to open my file:

 

"Unexpected error when detecting file type for file C:\ (...) hexadecimal value 0x00, is an invalid character, Line 80547, position 10".

 

I have already translated about 6k words of that file but have not sent any segment to the TM yet, which I was planning to do after my review. Please tell me there is a way to salvage this file...