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Francois_C - FWIW I find the easiest way to add a new ebook format (eg ODT) to an existing book, is to drag the file from a file manager and drop it onto the book details panel - its a big target and therefore not easily missed
I do something very similar to what you seem to be doing on 10-20 'books' every day.
- I first convert <whatever> to RTF in calibre.
- From calibre I open the RTF in Word.
- After a applying a couple of RTF-only macros I save as DOCX.
- I close the DOCX in Word.
- I go back to calibre and open the book folder (press 'O')
- I drag/drop the just created DOCX file to the book details panel.
- I then 'View' the DOCX from calibre in Word and do my editing.
- As and when I 'feel like it' I close the DOCX in Word, go back to calibre convert the DOCX to EPUB and have a look at it.
I keep the RTF until I have an acceptable EPUB then I remove it via Alt+Del.
In Windows Word locks the files it has open, if I try to do anything with such a file in calibre (e.g. convert) then calibre will pop a message telling me the file is locked. File locking is a Windows feature, I don't know if Open Office makes use of it.
I often make 'mistakes' when I get an interrupt, phone, door, text message etc. So, I put a pro-forma check list into the books I'm working on. Its in the form of a OneNote note (.ONE file), it gets removed along with RTF when I have 'finished' a book. My 'mistake' rate has dropped to near zero since I started to do this.
Occasionally I will have a book that requires extra steps in the process, often using software other than calibre, word and irfanview. I those instances I create a directory out of calibres reach and copy what I have in the calibre book folder to that location. I then use whatever tools are needed - including calibre command line tools - to get the job done. When I'm done I copy the files I want to have in the calibre book folder via drag/drop into the book details panel.
BR