I believe that you should be able to read that runtime by adding it it P5's runtime same as adding P4's. From the libraries pallet select a catagory, say figures. Expand it then keep clicking on the uppermost folder until you see the P5 with a red dot. Then at the bottom you should see a - and a + sign. Click on the + to open up your explorer. Locate your usb drive and add.

I must remember to remember what it was I had to remember.