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You can use Reg2ADM (http://www.novell.com/coolsolutions/tools/13885.html) which will convert your .reg file to the group policy template format. (you can edit it in notepad to ensure the correct syntax)
Once you have your ADM file correct, import the ADM into Group Policy Manager (ensure you don't have unconfigurable options hidden). You can then apply the registry settings against your target users
Here is a useful link
http://thelazyadmin.com/blogs/thelazyadmin/archive/2005/07/05/Creating-Custom-ADM-Templates.aspx
Hope this helps