FrameMaker 3 files

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I've tried using FrameMaker v7.1 and its "heroic open" (Esc o H) to open five different FrameMaker files. It hasn't worked.

The only real progress is that it tries... it begins with a dialog box that says "Opening a FrameMaker 3 document. OK to continue?" But then a second dialog box appears that says "There was a problem reading this file. Please check your file system, disk, and network."

Anyone have any ideas?