Tilt!!!

You may find that this DOService has nothing to do with the file's extension, it is a matter of the Security settings on the filter of the server's Anti-Malware program...the server being set up on the school's office or the multi-media centre's main office...wherever your client computer runs from...

Certain sites have been predetermined to be sites that "you" are not to be exposed to ...period! So, no adulteration of the "facts" on your part, from a client of the server, point of view, is going to subvert that intent.

BTW...no software exists to completely hide you from the internet...it is all hype... Computers need to be able to both "see" and "hear" each other ...and if they cannot, then they cannot communicate with each other ...period!