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@shentar - read the "PLEASE READ..." sticky at top of Development sub-forum.
can you indicate in your next post whether you're prepared to any necessary development for this.
AFAIK - there is no way to add support for new a format without changing the calibre code and/or developing a driver as per
jgoguen's post. Convertible formats require Input and Output plugins.
You can add non ebook files via the
calibredb command using the
'add' option. So you could write a script/batch file to walk your directory tree and add the .nef files via that command.
Quote:
Originally Posted by JSWolf
.nef is not an eBook format. NEF is Nikon Electronic Format fir RAW image files. So nobody is going to be writing code for Calibre to support Nikon RAW images.
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- I have a bunch of them. But I don't think there's anything to stop someone else using it for another purpose Ψ²
BTW is this yours
File extension WOLF 
BR