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Now that I think about it, I would like to see Breadbox open-source some of the Import/Export filters and drivers. Why not provide support to developers who want to update/create drivers and filters? You could start with the Postscript Driver, Excel 98 and Word 98 filters. Oh, and the HTML filter.
I for one would download these and work to fix/update them just for fun.
The original set of Import/Export filters were licensed from another company. I don't know if the licensed code is contained entirely in the filters or if it extends into the ImpEx engine. If it's in the engine, that open sourcing things may not be possible.
I think the RTF filter was written entirely by Breadbox, so that's probably the best one to ask about if you want to push the issue.