Why it is necessary to prohibit opening defined files for protection?

This post is simply for knowledge.

RSS 2011 home version.

File Protection.
Files defined are protected from virus and, therefore, can not be opened.

supposition:
I have made a Word.doc file, and a Notepad.txt file, and a photograph.jpg file,
and have them defined in File Protection.
The .doc file and .txt files canNOT be opened.
The .jpg file can be opened for viewing only but can't be changed.

My question:
Why it is necessary to prohibit opening the .doc & .jpg files for protecting them from virus?

Thank you.

 

Hi fuquen,
The File Protection feature is a stop-gap legacy solution for providing a means to protect content on non-system drives and partitions while the multi-disk virtualization capability was in development and testing.

In the current versions, this is like your appendix that DOES have a purpose, but that purpose may not be used frequently or even needed for the overall strategy being used. The way it was designed was to keep outside threats from making potentially harmful changes to the content defined and not about overly restricting an authorized user's access.

Mike