First the HTML source code :

<form action="test.php" METHOD=POST enctype="multiport/form-data">
<textarea name=text cols=20 rows=5>
One line.
Two line
Three line
</textarea>
   <INPUT TYPE="submit" NAME="Submit" VALUE="Save"></CENTER>
</form>

Then test.php source code :

<?
 $fichier = "test.txt";
 $temp = fopen($fichier, "w");
 fputs($temp,stripslashes($text));
 fclose($temp);
 print "Done !";
?>

When I open the test.txt the text isn't save like it would be. 
Here the result :
One line.

Two line.

Three line.

It seems that a \n is added at each end of line of the textarea.

A friend try this code source with PHP 4.0.3pl1 and it works fine.

I have found a solution to have the file well saved using this line code :
$goodtext = str_replace("\n", "", $text);

This is very strange and i can't affirm that it is a bug.

I have also try without enctype="" and with last CVS. this does  nothing better.

Have fun with this ;)