Problem opening a file

[n3g4o]

Hi! i hope you can help. I have a file that it can't be opened. I suspect it is related to a message that i get from time to time inside wxmaxima. "Warning: Can set maxima's working directory but cannot change it during the maxima session :".

Last time i had a file that i was forced to wait minutes to open, and when it was, there were several of this messages, like about 50. I don't know why it does this, but i never thought it will be this troubling.

I know there are several of this messages in the file that can't be opened because i looked inside with a text editor. I don't know what to do to solve this thought. i've tried deleting those parts, not worked. I looked something like recovery with no success.