I know this thread is a few years old but I thought I would append to it for the bennifit of anyone else looking for this specific answer, like I was.
In your property loader setup, on the source tab, select "Use Expression To Specify File" and type in:
Left(ThisContext.RunState.SequenceFile.Path, Find( ThisContext.RunState.SequenceFile.Path, "\\",0,False,True )) + "\\Limits.txt"
Where Limits.txt is whatever file name you want to use and the properity loader will look for the file in the same directory as the loaded sequence file.
Cheers
Gregory Osenbach, CLA
Fluke