R.bin vs R as app name in Mac OS X

I discovered today a curious behavior of the Finder.

If you double click on the R icon directly, on Panther, you'll see 
R.bin in the application menu. If you call R via an applescript like 
the following, you'll see only R as it should be.

try
	tell application "R"
		activate
		with timeout of 1000 seconds
			cmd "print(\"HelloWorld!\")"
		end timeout
	end tell
end try

Now I'm waiting an answer from Apple...and will let you know.
stefano