If you want to extract 7z file password, then using SysInspire 7z Password Recovery tools. It can apply three recovery processes - Mask attack, Brute force attack, and Dictionary attack and crack all password combinations like-byfgh,redhg,4546bfhh/? etc. The restore password you can easily copy on the clipboard. It can provide you with a free demo version which easily recovers the initial 3 letters 7z password.
Read More:- Free 7z unlocker tool