read-only file

Sorry if this is the wrong place to put this but I need this question answered badly. I need to open PowerPoint presentation which was emailed to me. But this error pops up:
The file may be read-only.
Can anyone explain whats happening and provide a solution?

I would suggest right clicking the file, choosing Properties, and making sure it’s not blocked.

FYI - this isn’t a Microsoft forum, you’d probably get real answers there.