[mrgeoff]

http://msdn.microsoft.com/en-us/library/ms889522.aspx

Microsoft recommends that you use a three-digit number in the name of your .provxml files in ROM, such as mxip_opr_100, mxip_opr_200, mxip_opr_300, so that there is an adequate number of ordinals to identify successive versions of the file.

I usually do a mxipupdate_geoff_100.provxml, mxipupdate_geoff_101.provxml, etc