Atom file icons of executables

[Richard Hainsworth]

I use atom to edit perl6 scripts because of the nice perl6 syntax 
highlighting. Also I came across Atom from this group.

Although files with .p6 or .pm6 have a nice camilea icon associated with 
them, ...

... if I give a p6 file an exec bit, the icon changes to something like 
an onion.

I'm using Ubuntu.

I've searched on Google, tried StackOverflow, and tried the Atom sites. 
I can't find where to look to change this behaviour.

Sorry for the slightly off-topic question.