Given a bin file, how to tell whether it's PAL or NTSC ?

[BMWZ3]

I tried ISOBuster, didn't really know how to use it. But I tried using the NTSCCONV and ran it through the bin file, if it's in NTSC format and I say to convert to NTSC, it leaves the file alone, so it looks like I can tell whether it's NTSC or PAL this way .......... cool !! Thanks !!