$C398/50072:   Check given file type

C398: A0 00     LDY #$00
C39A: AD 77 02  LDA $0277
C39D: CD 78 02  CMP $0278
C3A0: F0 16     BEQ $C3B8
C3A2: CE 78 02  DEC $0278
C3A5: AC 78 02  LDY $0278
C3A8: B9 7A 02  LDA $027A,Y
C3AB: A8        TAY
C3AC: B1 A3     LDA ($A3),Y
C3AE: A0 04     LDY #$04
C3B0: D9 BB FE  CMP $FEBB,Y
C3B3: F0 03     BEQ $C3B8
C3B5: 88        DEY
C3B6: D0 F8     BNE $C3B0
C3B8: 98        TYA
C3B9: 8D 96 02  STA $0296
C3BC: 60        RTS

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