I had found that page previously, but it didn't have anything really useful for getting data out of the IMP format. What I think is wrong (or correct, if you will) is that the files from non-Book Publisher sources are compressed using the LZSS algorithm, hence the reason no human-readable text is available. I draw this conclusion from what I found on the website previously referenced and the fact that the data file holding the bulk of the eBook (data.frk) uses a known file extension. Unfortunately, the few decompressors I found for the LZSS format either a) crashed (very old code) or b) simply did not work.
Not sure where to continue with this other than to use the method I've been using. Thanks for the tip, hopefully someone with more ninja skills than mine will cobble together some for of IMP text extractor.
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