i was wondering where my save file location is becasue i want to uses a modded save file

For me it's Program Files (x86) > GOG.com > Fallout > DATA > SAVEGAME

i go there but the folder is empty and i cant find my saves

Hrm. What OS are you using?

Click on Start.
Where it says "Search programs & files"
Type %saves%
& hit enter.
Scroll through your saved games until you find where it is hiding your Fallout saves.

For me it's:

C:\Users\<username>\AppData\Local\VirtualStore\Program Files (x86)\GOG.com\Fallout\DATA\SAVEGAME\

I'm using Windows 7 64 bit.

(Note if you're trying to use Falche character editor it actually asks you to "Select your Fallout directory" in the dialog box, not the savegame directory, so pick \GOG.com\Fallout if that's what you're doing)

If you are using Vista or Windows 7 it will be in the location (Known as "virtualstore") mentioned by drstupid. This is due to a security feature that does not allow Fallout (or any other application) to write files such as saves to the install directory in Program Files, so Windows supplies a virtual directory (Which looks the same to the game, but not to us) instead.

my slot01 file is hidden

nvm i found it stupid hidden folder

I have Windows 7 64bit as well. What version of Falche works with this os?