It's not necessary to add it to the filenames.php file (even better if you don't modify the core files).
Maybe it's because of the location of your filename_here.php file? Try using
Code:
include(DIR_FS_CATALOG.'path/to/your/file.php');
Where exactly did you upload your filename_here.php file? If you uploaded the file to the store root, then it would look like this:
Code:
include(DIR_FS_CATALOG.'file.php');
If it's under includes/modules/ then it can be like this
Code:
include(DIR_FS_CATALOG.DIR_WS_MODULES.'file.php');
OR
Code:
include(DIR_FS_CATALOG.'includes/modules/file.php');
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