I'm struggling with loading png games from Launchbox, which is a front end game launcher. I have tried the zip and installer file in several locations, many combinations of command line arguments and still no luck. I only get the error mentioned in the topic title. Any suggestions?

I've never used Launchbox, but the error seems to indicate that it's somehow passing "pico8.exe" as the param to -run.

Turns out I'm still learning after all these years: when i first set up the emulator, even before I added games, I put the arguments in here which I think was messing things up:

I had the -windowed 0 -run in there, but after I cleared that out as shown above, it's working as it should. Thanks again for all the support.