Things You'll Need
Instructions
Insert the PSP memory stick directly into your computer, or connect the PSP to your computer with a USB cable.
Find the PBP files on your computer. The file should appear in "My Computer" under the folder correlating with the USB port you used, such as the E: or F: drive folder.
Right-click on the PBP file you want to compress. A drop-down menu should appear, giving you a list of options for what to do with the file.
Hold your mouse over the "Send to" option. A new menu of options will appear to the right of the drop-down menu.
Click on the "Compressed (zipped) folder" option. A compressed version of the file will then appear in the folder.