Description:
------------
When i use the tempnam() function a file is succefully created but it seems that the file is not writeable.

I am running php 4.3.9 on IIS 5 as CGI on windows 2000.

Reproduce code:
---------------
<?
// create a tempfile for the thumbnail
$tempThumbnailFile = tempnam ("tmp", "thumb");
// write the contents of the zip entry to the tempfile
$handle = fopen($tempThumbnailFile, 'a+');
fwrite($handle, $docData);
fclose($handle);
/*
	DO SOME PROCESSING ON THE FILE
*/
// Read the contents of the files into a string.
$thumbnailData = fread(fopen($tempThumbnailFile, "r+"), filesize($tempThumbnailFile));
?>

Expected result:
----------------
I expect the a tempfile to be created and I expect to be able to acces this file for write acces in order to manipulate the file contents.

Actual result:
--------------
Warning: filesize(): Stat failed for C:\Windows\TEMP\thu8450.tmp (errno=2 - No such file or directory) and so on.................. The file is created i can find it in explorer.