Updating (appending) a file

I cannot figure out how to access the file and update it (which is just /files/*.txt from where I'll be accesing it -- in other words I'm accessing it from mydomain.com/index.php, but the file is mydomain.com/files/Names.txt). By update I mean append. I tried to access it with the complete local address (C:\\... it's a IIS5 server on Win2k; I did use the \\). So, what file path do I use to update (append) a file on the same Windows 2k server as my web server (/files/*.txt is the location of the file relative to the PHP code being executed). I want to be able to update the file on my server (which can be accessed through FTP the way $Location works out, if I do it manually in the browser). My question is how do I go about accessing it? Do I have to use the ftp_connect(); functions somehow or can I just go about with something like this: --------------------------------------------------- // This doesn't work though: $Location = "ftp://". $Find->USER .":". $Find->PASS ."@mysite.com/files/". $Find->BRANCH .".txt"; if (!$fp = fopen($Location, "a")) { // This is always what shows Error("Error: 0001. File (". $Location .") could not be found."); } else { if (!fwrite($fp, $Find->Line)) // line is an HTML tag/link (Something like "<A HREF="http://somesite.com" ALT="blah">") { Error("Error: 0002. Information was not written."); } if (!fclose($fp)) { Error("Error: 0003. File close error."); } } ---------------------------------------------