[color:"orange"]Do you mean it's possible to do text edit of this file??[/color]
No, but it may be possible to replace the skill section (in whole or in part) of the file using a hex editor. The data.000 file keeps track of all character and NPC data, as well as some quest information, so (as you already found) it can not be swapped between saves without causing problems.
Even if the skill section can be replaced (it can between English saves, IIRC) you would have to re-learn all your skills again (ie taking the skill section from a new French save would reset them in the current English save) after giving yourself the corresponding number of unused skill points.
The easiest method would probably be to use
iZakaroN's SaveEditor (or from
Kiya's site, with description) to unlearn all skills first, assuming it works on a French save, then do the hex editing, then re-learn everything.
[color:"orange"]I suspect it's something related to male/female. Something that doesn't exist in english version but in french version.[/color]
If unicode support was added to the French version of the game to be able to handle accented characters (that do not appear in basic English character sets) that might cause problems. Even different length descriptions after translation could be an issue.
[color:"orange"]EDIT : I gave a try to binary compare data.000 files[/color]
Even with saves from the same game, if I want to do a binary comparison to figure out how to edit a particular value or attribute I try to pause the game as much as possible to limit the number of things which can change between the 'before' and 'after' saves. Even then the file size can change, which makes it much harder to compare the files (ie it is easier to redo the saves).
Check your PM (click '
My Home' in the top menu bar, then 'Received Private Messages').