Trying to get a complete run of acceptance tests done before 2.8 release, I faced a problem with cron.php with IE10, impossible to display output and asking for download or open with wordpad instead.
It seems that with
MDL-39967 we killed the hack (coz it was working with IE8). But it seems to be hitting us back with IE10.
Also, I've read that we could be using the "nosniff" header (we already use it in other places within Moodle). So perhaps we could add it to cron.php.
Main reason is that acceptance tests require contents there to be checked.
That is it, ciao