The primary difference between the two formats is the presence of a copier header .smc (Super Magicom):
: Frontends use a file's "hash" (a unique fingerprint) to download cover art. An .smc header changes that hash, preventing the software from finding the right metadata. Recommended Tools : Use a simple SMC to SFC web converter for quick, one-off fixes. Desktop Utility : Tools like Super Beheader smc to sfc converter