We often drag files from the book folder to the Book Details panel - scenario.
- A book is added via an RTF file from a file manager using the Windows Send to feature;
- We open the RTF in Word via calibres Open With feature;
- We save it as DOCX to the same location as the RTF;
- We close the document in Word - to unlock the files
- We go back to calibre, press 'O', and drag-drop the just created DOCX into Book Details. That records the existence of the DOCX in the database, I can't recall if the file itself is wrangled in any way, my memory is that its create and modify timestamps don't change.
It's not only RTF we handle in this way, ODT and TXT also get converted to DOCX and some PDFs; and we do similar with video and audio formats, converting say Jing SWF to MP4 with Handbrake, FLAC to MP3 with Audacity, EPUB to MP3 with Balabolka etc.
This process is embedded deep in our collective psyche, so, we'd hate for it to stop working
BR