Look Janish at the moment i have no time to produce a full, working Tk example but you have a lot of possibilities. First of them you can create so called hyperlink (as in zentara example) and modify the sub to spawn another windows where the file content is showed. see Displaying text file with perl/tk for an example.
You can also, if nasty, make a system call to open the editor of choice with the path as argoument.

L*