PTC unc.hol file is incorrect for clearance holes.

I have noticed that the clearance hole sizes for UNC holes are off. Up until Creo, I simply edited a hole diameter in the creation process, but now I am unable to modify the value as it is greyed out. I attempted to change the .hol file manually, and the folder is read only. At this moment I am making a copy of the file an editing it, I will either need administrative help to replace the original file, or use a parameter to point Creo to a new locationfor the files. Anyone know what this parameter might be?