try
LUName = "S:\CP_Students\2011\Fall20~1\CoryCo~1\CSIReg~1\CS IReg~1.accdb"
8.3 filename - Wikipedia, the free encyclopedia
to convert long file names to 8.3 format
drop any spaces, take the first 6 characters use a tilde ~ and a single digit number indicating the index of the file
the potential issue you have is
LUName = "S:\CP_Students\2011\Fall 2011\Cory Colin\CSI Registrants2011-12\CSI REGISTRANTS.accdb"
csi registrants 2011-12
csi registrants 2012-13
would both have the same initial 6 characters
csireg
one would be ~1, one ~2, Im guessing base on the age of the files creation or possibly filename.
you will run out of filenames after 9, possibly 10.