Hello; This must be the first time I have encountered this: I have an html interface with text input fields for entering file names. The underlying javascript sends and async request to verify that the file exists on the server I have used both is_file and file_exists. If I use wrong case in the file name but the location/name is correct both the php functions return true. That would indicate that they are not case sensitive in matching a file name. How can I make them case sensitive? If I go to open and read or write to the file and it has wrong case in the file name I am expecting that the read/write or unlink, or other file processing function will not work. Thank you for time JK