Interleaf to PDF

You would have to get a contract with RTX in order for me to extract IDUs and provide PDF files.

An Interleaf/QuickSilver IDU file is a combiner file. It is used to combine files (eg, a book, book autonumbers, revisions, etc.) into a single for for transporting across different OSs and archiving. It is not a compressed file (which is an IDUZ file). Depending on the age of the file, QuickSilver 2.0 may be needed to extract IDUIs created prior to QuickSilver 2.0 (Interleaf 5, 6, and 1.6.1). QuickSilver 3.8 can extract QS 2.0 and newer IDUs. QS 1.6.1 was the first Windows PC version.

As I recall, Interleaf became QuickSilver, which was Broadvision {.com} and is now apparently aurea {.com}. It claims “QuickSilver greatly extends the capabilities of traditional Interleaf technology (acquired by BroadVision in 2000) and is fully compatible with Interleaf 6 and 7.”

And that's more than I know about it. The one time I had to convert an Interleaf document {back} to .fm, was over 30 years ago, and I don't recall any automated tools being available then.