I made Notepad++ the default editor for php files, so that I can double click a php file and automatically start Notepad++
However, if I double click on a long filename file (e.g. class.mysql.php) Notepad++ loads the file as CLASSM~1.PHP but if I open the same file through the File>Open dialog, Notepad loads the file with the correct filename class.mysql.php
this problem is fixed in v3.0.
just be patient.