Ok thanks very much for this first answer,
Effectively i saw in C:\users\<your username>\appdata\roaming\BitShares\wallets
a json file with "encrypted_private_key" value
Miracle ? but one of this file date is from september 2014 when i have first installed BitsharesX
I will now take few hours to study how to recover my BTSX (is it normal to take hours study when it normally will be "fluide" (so easy) to use BitsharesX
?) I dont think that as with Bitcoin i can make MYSELF ALONE a signed raw transaction
and broadcast it MYSELF ALONE without this BitsharesX API, but i will try.
So if i recover my BTSX equivalent money, i will not take days and days to destroy BitsharesX reputation on Facebook, tweeter, youtube, etc...
Thanks again,1000 BTSX is not so much, i know it is not 1.0 software, but it make me so furious, so furious !