Easy!
1.Make a shortcut from your mir4.exe and put it on Desktop.
(by the way I've got Win XP, so this part may be slightly different for you)
2.Look in the target box, you should see the location of the file which you are shortcutting, the location should have some " around it. eg. "C:\Program files\WEMADE\LOM3\mir4.exe"
3.Add this to end of target -u
or if that don't work put -y
So the target will look like this
"C:\Program files\WEMADE\LOM3\mir4.exe" -u
or
"C:\Program files\WEMADE\LOM3\mir4.exe" -y
And you sowted!