How do I enable fileinfo?

I have followed this article but still im getting same error

[quote]Oops! Please correct the item(s) below, and then click “Refresh information” to test the compatibility of your new system.

Required PHP parameters
Fileinfo extension is not enabled [/quote]

Did you make sure that your .php directory starts with a period?

Did you make sure that the directory you created within that matches the version of php that you are running on that server?

What is the contents of your phprc file?