Description:
------------
1. Running XAMPP 1.5.5 on Windows with fdf-Support enabled and fdftk.dll version 5.0 (phpinfo says so), fdftk.dll available in System32 folder.

2. fdf_open("test.fdf"); results in the following error:

"A file system error occurred or the file was not found"

3. Crosschecked with file_exists() and is_readable() and both are true.

Reproduce code:
---------------
if (file_exists("test.fdf")) {
echo "File exists<br>";
 if (is_readable("test.fdf")) {
  echo "File is readable<br>";

   $fdf = fdf_open("test.fdf");
    if ($fdf) {
     echo "everything is fine, lets go!";
    }
    else {
     echo "Error: ";
     echo fdf_error(fdf_errno());
    }
  }
 else {
  echo "cannot read file";
 }
}
else {
 echo "file doesn't exist";
}

Expected result:
----------------
File exists
File is readable
everything is fine, lets go!

Actual result:
--------------
File exists
File is readable
Error: A file system error occurred or the file was not found