What do i do about a .100 file?

[Ouroboros650]

[font="Calibri", sans-serif]I'm new to the PS2 emulation scene and i recently downloaded Shin Megami Tensei - Persona 3 FES and instead of getting an .ISO or something else this emulator can read, it gave me three files:[/font]
[font="Calibri", sans-serif]Persona 3 FES.100 (This one contains most of the data)[/font]
[font="Calibri", sans-serif][font="Calibri", sans-serif]Persona 3 FES[/font].101[/font]
[font="Calibri", sans-serif][font="Calibri", sans-serif]Persona 3 FES.[/font]MDS[/font]

[font="Calibri", sans-serif]Does anybody know what I'm supposed to do with these?[/font]

[CK1]

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