Set "CustomConfigurationsPath" bug when using underscore in

Hi,

This may well be a known bug but since I couldn't find anything on It in Google or on this website I though I'd post a warning. Apologies if forums are not the correct place to report bugs:

I've found that when using php to set "CustomConfigurationsPath" the user chooses to point to can not contain underscore "_" or it will not work. Not sure if this is the case with other server languages:

$oFCKeditor->Config['CustomConfigurationsPath'] =  '/<path>/file_name.js'  ; //this won't work
$oFCKeditor->Config['CustomConfigurationsPath'] =  '/<path>/filename.js'  ; //this will

Hope this is useful,

Chopo