Steps to reproduce:
1. try to open some unprotected pps file, even the file is not protected and possible to open in Powerpoint from MS Office. LO does not ask for password. It shows only a error message. It does not happen with all pps files.
I get: reading error file protected by password
Opening pps file opens the file and shows the content
Platform (if different from the browser):
Browser: Mozilla/5.0 (Windows NT 5.1; rv:10.0.2) Gecko/20120216 SeaMonkey/2.7.2
*** This bug has been marked as a duplicate of bug 38370 ***