Can't View .RVMAT's (Material Editor error on load)

[scarecrow398 43]

So, i can't recall when this started happening but as i've started working on texturning here and there, this is getting slightly more important than it used to be...

So, Material editor was working fine up until about 2-3 months ago i would guess and now it displays this error on start up

"Error during I/O (3, description:LSStructure) In file "(Directory of file)" Do you wish to open in text editor?"

Any ideas?

Checking through some old work i was given back in feb/april last year is somewhat okay, is it something to do with binarization as all the files form back in feb are original while all the recent stuff i've been given permission to edit from the .PBO

Edit: Nvm, creator cleared that up... (Binarised if anyone finds this thread in the future.)

Edited February 1, 2013 by Scarecrow398