If you have a '365 Personal license, you can use Outlook to open / read any PST file.
Just download / install Office from the link provided in the previous response.
https://account.microsoft.com/services
The first time you run Outlook, it will require you to configure an email account. If it doesn't do that, it means that Outlook has been previously used on this computer.
To open a PST file in Outlook that is not already in the Outlook profile, from within Outlook, go to
File --> Open & Export --> Open Outlook data file --> browse to the desired PST file and select it to add it to Outlook.