Icons and Launchers with Wine

The relationship between .desktop files and how the integration (which doesn't seem to be complete) with Wine is confusing to me. I understand that .desktop files enough to make them myself, but I do not understand how I could get the icon resource from a Wine executable, or default icons that Wine would use (as a Windows compatible environment)

A good example of this is when I installed Diablo II, which btw was really awesome because it worked flawlessly on my very ancient laptop using Beryl! I was slaying demons while wobblying my windows on 2 faces of a cube, okay, enough of that! More importantly, when I installed it created the shortcut on the desktop and start menu (inside a menu named "Wine") Later when I went to modify the shortcut settings I wanted to replace

diabloii.exe

with something more elaborate like:

diabloii.exe -w -nosound

but I could not figure how to modify the existing launchers, and after creating my own launcher I lost the cool diabloii.exe icon of the lord of flame himself and was forced to only a moderately evil desktop environment. How can I get the diaboii.exe icon when creating my own launcher; or how can I modify the existing launcher. Is this something I need to take to the wine mailing list (please say no!)

Cheers,
Kristopher Ives
www.krisives.com