Path returned from Scriptmaster Select File and Import Records

I am trying to use SM's "Select File" dialog to get the path to a file that I will then Import. (using it to grab the name of the imported file)

Issue seems to be that the file path formats are incompatible.

E.g.

Select File returns (Mac system): /Users/Me/Directory/Filename.txt

But Import Records seems to expect fullpath format: filemac:/VOLUME/Users/Me/Directory/Filename.txt

Anyone know how to grab the volume name from Select File (under the idea that the file may be on a remote volume), or can tell me where I can modify my logic (e.g. will file: relative path work?)

Cheers,

Juz