Currently supported formats:

• .CAS (MSX)
• .TAP/.KCC (KC 85/1, KC 85/4, ...)
• .SSS (KC 85/3, KC 85/4; use filename "TEST" for loading)
• .P (ZX81, use filename "TEST" for loading)
• .T64, .TAP, .PRG (C64, experimental)
• .Z13 (Z1013)