I think you put the PSV file in PS3\EXPORTS\PSV of the USB drive. Then copy it (via XMB "Memory Card Utility") to PS3's virtual memory card.
At that moment, can you use CMA to copy the virtual memory card save to a Vita ?
lol. Would be great if you can document the steps. Sounds like a major operation. ^_^
Sure!
1. Create this path in the root directory of the external storage device that you will be connecting to the PS3: PS3 -> EXPORT -> PSV.
2. Place the PSV file in this directory.
3. Connect the device to the PS3 and go to Memory Card Utility under GAME. Scroll to the top and you should see your device.
4. Connect your PSP to the PS3 and make sure the USB connection is active on the PSP.
5. Navigate to your external storage device and you should see your PSV files which show up as proper PS1 memory card saves. Copy them to a virtual memory card on the PS3. You will have to create one if you haven't already.
6. Navigate to the virtual memory card you copied the save to. Highlight the desired save file and hit Triangle, then choose "Copy". Copy it to the PSP, which should be near the icon for your external storage device.
7. You will be asked if you want to convert the save before copying, choose yes. Remember which virtual memory card you copied it to.
8. After it is done copying (this may take a while if you have a lot of saves on your PSP memory stick), disconnect the PSP and connect it to your computer. Remember the memory card you copied it to. The name of the game is key in finding the VMP. For example, let's say I copied it to a virtual card created for "Silent Hill". On the PSP memory stick, navigate to PSP -> SAVEDATA.
Now go to gamefaqs.com and look up "Silent Hill". Click on the "Release Data" link. The product ID is the folder name. The US version of Silent Hill's product ID is SLUS-00707. So find a folder named SLUS00707 in the SAVEDATA folder. You will see two VMP files. SCEVMC0.VMP and SCEVMC1.VMP. If you copied to the first memory card slot, your save file will be in SCEVMC0.VMP.
9. Copy this file to your computer. You're going to need to put it in your computer's Vita saves directory, and connect the PS Vita. Refer to your Content Manager settings. The path should be: PS Vita -> PSAVEDATA. On your Vita, you will need to have a PS1 game save copied. In the PSAVEDATA folder look for a folder which has the letters SLUS at the beginning. These are US PS1 save folders. Refer to Gamefaqs for product codes of different regions.
Copy your VMP save to this folder. If you have saves you don't want overwritten in this folder, rename your save to SCEVMC1.VMP if you saved in the first slot.
10. Back on your Vita, select the PC -> PS Vita option and your Playstation save should be there!
I'll proofread this later, I need to upload this save for him now.