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Mac OSX Icon Sizes
http://www.softwaretipsandtricks.com/windowsxp/articles/77/1/Mac-OSX-Icon-Sizes
Super Admin
 
By Super Admin
Published on 02/23/2005
 
Ever wanted you Windows shell to look similar to a Mac OSX?

Mac OSX Icon Sizes

Changing the icon size  will add that final touch.   Mac OSX has a max size of 128x128 icons. (Windows Max: 72x72).

Open Registry Editor.
Click on HKEY_CURRENT_USER 
Then expand Control Panel.
Then expand Desktop.
Then expand Windows Metrics
Select the  Shell Icon Size key.
Right click Shell Icon Size and select Modify.
Then type 128 in the box, and there you go!
Huge Mac OSX size icons!