I put the SD card from my rooted optimus m into my F 6, and found these

[MyUsernameRox]

I had rooted my optimus m with GingerBreak and installed cm7. I later did a factory reset on the phone, but it looks like the stuff was still left on the SD card.

I found this when I put the SD card in my F6 and was looking around via file manager.

What will happen if I open any of these? I'm asking before doing it because I don't want to do something that will accidentally mess up my phone.

 

[Rukbat]

It depends on what they are. Pictures, videos, music, stuff you put on the card? Nothing, they'll play, display, etc. Files you don't recognize? Run a good virus scanner on the card, then run Malwarebytes on the card. Then, if I were you, I'd format the card anyway.

(Factory reset doesn't reset the card on all phones.)