The error message that MindJet 2017 returns when trying to open the MindManager 22/23 file is below
Have you attempted to do as the message suggested and contact MindManager support?
Also, it may be worth trying to create a simple map in 22/23 then opening it in 2017. It’s possible that maps which use features added in later versions are the only ones affected. For, example, I’m not sure when SmartRules were first added to MindManager, but I suspect that earlier versions might have difficulties with them.