SEP Weekly report file format -- Change file type?

SEPM sends out a weekly report.  It emails an .mht attachment.

We're having issues with that getting caught in our spam filters simply due to the file type.  And I can't easily open it -- For some reason I have to clear my temporary files and then I'm able to view it.

Is there a way to change the file type on those weekly reports?  I'm looking around SEPM but I don't see anything.