@Kovid
@Davidfor
I think this is getting away from my original ask. All I wanted was for the viewer to recognise that a file with a KEPUB extension doesn't need any sort of change to be viewable. This is easily proved when I rename these files (all of which have been created from an EPUB in the first place).
If the viewer would treat them as EPUB I can then associate KEPUB with the viewer at O.S level and be able to view the actual (un-reconverted) file by clicking on the KEPUB format in Calibre.
AIUI files from Kobo won't have .KEPUB extensions anyway (though I may be wrong as I have never bought one) so DRM isn't an issue.
If a small change to the viewer isn't practical then please, on my account, don't spend any more time on this - I'll live with CR3 and its imperfections as my check viewer. I only wanted it for simple checks not to read whole books; that's what I have the Glo for.
Thanks both.
@BR
I was aware of the "mini-conversion" carried out on non-EPUB books but as KEPUBs are EPUBS with a different file extension no conversion should be needed.
BobC
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