Thank you for your reply.
Most of the files are scanned by volunteers, not commercial epubs.
I modify an ebook to the capabilities the ereader(Sony PRS-650) and myself.
In fact editing/replacing the style sheet, font-size and font-family
to have a maximum effect: the maximum number readable characters on the display.
The capabilities of Calibre to edit/modify a epub is often not enough for me.
I use Sigil(quality check of structure etc..), Topstyle and EditPadPro to edit style sheet and (x)html files.
When I directly modify a file from the library, the date, of course, doesn't change.
To day I modify new files before I insert them in the library, however the library contains more than 2000 unmodified
files and I like to see which files are "still to do".
Comparing file dates against the date I started to modify "old" files.
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