The "Pse" prefix is frequently used as an abbreviation for .

Double-click the file to automatically unzip it using the Archive Utility.

Could you provide more on where you found this file or what you are trying to achieve with it?

If you received "Pse87zip" from an unknown source or found it in a system folder, exercise caution before opening it:

Right-click the file and run a scan with your antivirus software (like Microsoft Defender).