Assuming you are trying to do:
Do $extobjects.FileOps.$openfile(lPath)
But you need to create and use an Object variable with FileOps as sub type, and then try:
Do lFileOps.$openfile(lPath)
The other potential ‘gotcha’ when moving up to 64-bit macOS Studio 8.x (which you may know about already) is that you need to convert all HFS file paths in your library (using :), to POSIX file paths which use ‘/’ (forward slash).
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Scott on Scott on 
Paul Mulroney on 
Brian Germann on Scott
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