Relative path in mup/project file

Hello,

Anyone know of a way to get the mup file to use relative paths for the reference layers? Similar to ArcMap's File > Map Document Properties > Store Relative Paths to Data Sources option. Didn't see anything in the help file or manual. Working around it now by using a relative path'd lyr file, but that's a little cumbersome. Looked inside the xml of the mup, but the paths are all inside the encrypted text.

Thanks,
Brian