I'm pleased to read that you solved your problem.
However, the best way by far to attach reference files is using a MicroStation configuration variable. MicroStation configuration variable MS_RFDIR is such a multi-path variable. You can define one or more paths in MS_RFDIR that MicroStation will search for reference attachments.
If subsequently you change the location of some reference files, it's necessary only to modify the definition of MS_RFDIR to enable MicroStation to find the files in their new location. For example...
Original reference file location:
c:/refs/
New reference file location:
c:/notRefs/