Hi.

Problem Solved.

Found here : https://unacatarsisdetransfiguracion.wordpress.com/2007/11/04/how-to-open-a-file-in-opera-from-notepad/

Solution : I edit the Windows Registry to add firefox.exe (x64) in “app Paths” key.
reg.exe add “HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\firefox.exe” /ve /d “%programfiles%\mozilla firefox\firefox.exe” /f

I think it was old path, firefox x86.

Bye :)

Thank you very much!