I've been doing some SPLORE'ing and set up a list of Favorites - now I'd sort of like to have a look at the cartridge files .. but try as I might I can't work out where PICO8 is storing my Favourited carts .. its not in ~/Library/Application Support, like I thought it might be .. is there somewhere else to look?

All carts downloaded by splore end up in ~/Library/Application Support/pico-8/bbs/ using their BBS numeric identifiers. This might just be a cache but it looks like you can rip them out, give them real file names, and move them to .../carts/ for keeping them locally. (From experimentation, it looks like bbs/ keeps its contents even after restarting. No idea if it ever gets emptied.)

BBS-downloaded carts are stored in .p8.png format. You could use picotool to extract the title and rename the file pretty easily. https://github.com/dansanderson/picotool

You can also save them from within PICO-8. If you load a cart via SPLORE, and then exit the cart and then SPLORE, all the code and assets are still loaded, and you can just "save <filename>"

Cool, thanks for the info - I must have overlooked pico-8 in that folder last night while I was hacking around .. I'm now off to write an auto-renamer .. :)

FYI: From inside PICO-8 you can use the FOLDER command to open the directory where the carts are stored in the host system. This will open the carts folder in Finder on OS X. To see where that folder lives on your OS X system, you can right click (ctrl+click, or two finger click on a modern Mac) on the name of the folder in the title bar of the Finder window. That will show the "breadcrumb" list of folders to get there. Hope that helps.