Most of the links involved using a batch program which is clunky and tedious, I found a more intuitive solution that only requires editing one line of text in a shortcut.
Here's what I did using Windows 7:
Automagically set program priority with just the shortcut!
-create shortcut of executable (.exe)
-right click on shortcut and select properties
-click on the shortcut tab
-focus on the box labelled target, we will edit this
-notice in the box that the .exe location is listed, but leave the existing text alone
-in front of the existing text type the following (don't overwrite the file path

Code: Select all
%comspec% /c START /high
The full line of text will look something like this:
Code: Select all
%comspec% /c START /high C:\Users\YourName\Desktop\Filename.exe
What the line of text does
-launches the command prompt and tells it to start the file at the specified priority
-will change the shortcut's icon to the command prompt icon
^the fix for the above is easy, just click on change icon and select the original .exe file and select that icon