an icon is an icon is an icon
An icon (from Greek εἰκών, eikon, "image") is an image, picture, or representation; it is a sign or likeness that stands for an object by signifying or representing it, or by analogy, as in semiotics; in computers an icon is a symbol on the monitor used to signify a command
whether it be ico or png
Gizmo is correct in his statements and it would make things easier
I will need someone to lend me a wheelbarrow, however, in order to move my stuff from the OD gallery to the Misc. Icons gallery. and I said lend not rent

(smiley posted)