Open the PST file in Outlook.
If your version of Outlook is older than Outlook 2003, then it will not be able to open a Unicode PST.
If you are using Outlook 2003 or a later version then select the root folder of the PST file, in the Outlook Mail list column.
Right-click on the folder, and choose Properties from the menu.
From the Properties dialog box, click on the Advanced button to open the Personal Folders dialog box.
This contains a field called Format.
If it shows “Personal Folders File (97-2002)”, then the file is an ANSI PST, otherwise it is a Unicode PST.
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