there is an option to see the seed, but i can't see it since my electrum.dat wallet that contains my old btc is a corrupted file.I have tried to put a password but it didn't work also.
do i need to find a way to read my old electrum.dat file with an other tool than emacs ?
I honestly don't know what you can do with that corrupt file. Have you considered using a professional data recovery service? I don't know what else to suggest.