.imp is the native format.
There are converters out there that can convert to the .imp format. There's also the converter from ebookwise.com
I mention that site only because I'm not certain if you've seen it. There's a converter for sale from them, in addition to the 1150, of course.
I'm no expert on the Ebookwise, but there are some VERY knowledgeable people here with very good advice on the Ebookwise 1150.
Don
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