eboot invalid or unsupported format help

I read through the quick start
I have the same message
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E LDR: Invalid or unsupported file format: C:/Users/Mitch/Desktop/gamereenos/DeS/PS3_GAME/USRDIR/EBOOT.BIN
S LDR: Boot Game: boot done.
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what i am gathering is I did something wrong in the iso decryption process
first I will ask
will renaming the iso have messed up the decryption process? (I was renaming for my own OCD organizational convenience)
second
Which file should do step 9 on?
FILE_NAME.dec.iso
or
FILE_NAME.iso

EDIT: I am also noticing a problem with trying to Game Boot the Game disc in the optical drive as well (Demon's Souls)