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FrameViewer was discontinued some time ago, as Acrobat gained prominence.

If you don't need to manipulate the FrameMaker documents, ask your customer to provide PDFs. It's possible to convert many FrameMaker documents as a batch, using a FrameMaker book file. There's an option to combine the multiple FM documents into one PDF, or to keep them separate.

One benefit of creating the PDF with FM is that manually-created FM hyperlinks, cross-references, and TOC and index entries will be active within and across documents.

Another benefit is the option to create Acrobat bookmarks from designated FM paragraph formats (like headings, etc.)

Both of these will make your navigation in the documents easier.

Further, if you have full Acrobat, you can create a full-text searchable index from one, some, or all the PDFs, that makes it efficient to search through these thousands of files.

HTH
________________
Regards,

Peter Gold
KnowHow ProServices