Something very old and tired!
Looks like an old Dutch bayonet...
Severely modified French 1892 Berthier ?
I would agree with Ritchie B-sword bayo for the carbine Berthier but modified as a trench knife as the muzzle ring and quillon have been removed-also the locking catch is missing and the blade point has been reshaped/repaired.
Thanks for the help mates.I think yes,it is French 1892 Berthier.Very interesting because i live in Hungary,and i found it in my grandma's village.The old man says he found it after the war in his garden.
In 1944 russians attack the village and german-hungarian troops stopped them for 2 weeks.