Are the ZSNES data files compatible among the various ZSNES ports (Win/DOS/SDL)?
Yes. Unlike certain PC applications and games, ZSNES’s various save files and formats are completely port-independent; you can share any of your files with any user using any port of ZSNES (although some things may be version-dependent). Note, however, that ZSNES’s configuration file contains port-specific options which don’t exist in other ports, so while they can be transfered between ports, some things won’t work as expected. Note that when transfering various files, make sure they’re named properly and in the proper location.
