Not sure these files are allowed to end with an \. More importantly, these three new items must be listed before the first #. Currently, they are unfortunately all commented out. Yes, the syntax of this file is terrible!
I wrote a script to rewrite this files en massse because there are so many of them. The script intentionally adds a backslash to the end of all non-comment lines because on linux it just works, and having the \ there has the benefit of easier addition of more lines in the future.
The interesting thing here is that only the 64-bit mac version had problem with the backslash. Neither linux, windows or the 32-bit mac had errors.
On linux, the commented out lines did not cause any problems either. I don't know which program processes these files (and raised the error), but the 64-bit mac version is clearly different that the ones on linux and windows which both seem to accept comments in between lines and the last line ending with .