iTunes Backup Explorer is a graphical open-source tool that can show, extract, and replace files in iPhone and iPad backups.
It supports both encrypted and non-encrypted backups, currently from iOS 10.2 onwards.
Most programs that support encrypted backups are either limited trials or expensive. There are apparently only very few open-source projects that target this issue and none that are also useful for the average user.
https://github.com/MaxiHuHe04/iTunes-Backup-Explorer
Backup : itunes-backup-explorer-1.5