You may just be right. I just looked at my Office Bar Shortcut and remembered that it is a 32 bit program and in Win 64 bit it can't be seen there by the Office Shortcut Bar so I will have copied it over so it can be seen and accessed Sorry>
It does rectangular / square snips very well (far better than Print Scrn)
It still works under Win7 (including 64 bit versions), although I had to edit the registry to stop it asking me to confirm the language each time I launched it (I guess this was due to a UAC issue when I installed it).
Registry edit was in:
HCU\Software\MirWoj\MWSnap\Options where I had to change the Language key from "???" to "English.ini" (without the quotes)