How to Retrieve a Complex PST Password without Error

[Jamesnoah091]

I have an old Outlook PST backup that is protected by a complex password I no longer remember. I am the file owner and have full authorization to access it (this is a personal backup). When I try to open it in Outlook, I get a password prompt, entering possible passwords fails, and Outlook gives no useful error. I need to recover access to the PST without corrupting it or losing emails.