Most people call things like page.tpl.php "template php files" (some call them "tipple fips," and those people need to be stabbed ;)).
Then there's this thing called "template.php" which is not a "template php file", but is "the template php file" and this is always totally confusing to new themers, especially since there's absolutely nothing in common between these two concepts.
Whatever. Just not template.php. :P