This issue may also affect CAB, ZIP, JPG, PNG, RAR and all sort of compressed files. Microsoft has details the problem at :
Good news is that there is a fix available at :
Although MS has stated it should be updated via Windows Update, this did not appear on my list. However, a point to know is that most people thought you had to install this on the Server. Well, no. You will end up with some errors because you do not have the WHS Connector software on your server. (You do? Why would you install it on the server? :P)
Anyway, this is for all PC who send backup to the server using the WHS Connector.