Because when you don't specify, the URL function uses the extension of the 
current request. More specifically URL does this:

if extension is None and r.extension != 'html':
            extension = r.extension


Extension is None by default if you don't specify. However later URL also 
does this:

        if '.' in function:
            function, extension = function.rsplit('.', 1)


So another way to declare the extension you want (instead of passing it to 
URL with extension=) is to just put it in your function name, which is what 
you did.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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