How to display path of external being loaded?

Gui's icon

I have a custom external which is not any search paths, but it keeps getting loaded and I dont know how it is found by Max, it's driving crazy.
Is there a way to know exactly where the external is being read from ? (like Linux command 'which')
Would Max cache the externals somewhere , explaining why that external keeps getting found ?
I'm having this issue with both Max 7 and 8.

volker böhm's icon

file menu > 'list externals and subpatcher files'