[zinjen]

This may be a stupid question or already addressed so I apologize a head of time. Does anyone know if this is possible and if it is what directory is it located in via putty/winscp?

[Trent J.]

No it is not. You can change the image of when the apple logo is minimizing, but not the one that shows the majority of the time.

You can find the path for the minimizing one in the Wiki.