Are you expecting "show.exe" to run on the CLIENT (browser) or the web server ? I suspect you want it on the client. The proper way to do that would be to publish a link to the UNC path to the executable. That way, "show.exe" can reside on any server share, and be linked in from a web page. (All this presumes that this is on some local Intranet - this has some huge security implications).
"For every complex problem, there is a simple answer ... and it is wrong." --H.L. Mencken