I have a similar problem with a pdf file created from Frame
Maker. I am using the Technical Communications Suite, with an
'enhanced' version of Frame Maker, as well as Acrobat Pro Extended.
When I try to import the pdf file, I get the same message:
not a supported file type, or a corrupted file.
Yes, I know you can import the Frame Maker files into Robo
Help, but Robo Help is unable to handle complex formatting (cell
table, bullet item, one work in bold) without spontaneously
changing the font and the font size.
This file opens and displays fine with Acrobat 8.1 and
Acrobat 9 Pro Extended
Sigh.
I am down to editing the Robo Help files by hand, and praying
I don't do anything (like trying to split the topics up into
smaller pages) that will wipe out my changes (yes, there is a 'do
not update' setting -- that doesn't work, either 😞