If my file starts with <? instead of <?php AND php.ini has short_open_tag = off - converter just skips the file with message:
Status: OK
Number of mysql_-functions found: 0
Number of mysql_-functions converted: 0
Warnings/Errors: 0
Code length: 72 Bytes
Backup created.
File updated/modified.
Switches were: -u -v -b -w
Windows 7, PHP 5.6.7.