My&nbsp;Typo3&nbsp;is&nbsp;installed&nbsp;on&nbsp;windows&nbsp;NT.<br>The&nbsp;problem&nbsp;is:&nbsp;<br>In&nbsp;the&nbsp;extension&nbsp;manager,&nbsp;when&nbsp;chosing&nbsp;one&nbsp;extension&nbsp;to&nbsp;backup,&nbsp;it&nbsp;can&nbsp;be&nbsp;downloa<br>ded&nbsp;as&nbsp;a&nbsp;file,&nbsp;but&nbsp;when&nbsp;import&nbsp;this&nbsp;file&nbsp;to&nbsp;the&nbsp;EM,&nbsp;it&nbsp;reports&nbsp;&quot;No&nbsp;extension&nbsp;key&nbsp;<br>in&nbsp;file!&nbsp;Strange….”.&nbsp;Checking&nbsp;the&nbsp;file&nbsp;&quot;typo3/mod/tools/em/index.php”&nbsp;line&nbsp;125<br>6&nbsp;,&nbsp;function&nbsp;“extBackup”,&nbsp;I&nbsp;add&nbsp;some&nbsp;lines&nbsp;as:<br>                        if&nbsp;(intval($this-&gt;CMD[&quot;doBackup&quot;])==1)        {<br>                                $file_path=&quot;c:/&quot;.$filename;<br>                                $fp=fopen($file_path,&quot;w&quot;);<br>                                fwrite($fp,($backUpData));<br>                                fclose($fp);...<br>to&nbsp;write&nbsp;the&nbsp;file&nbsp;diretly&nbsp;onto&nbsp;the&nbsp;disk.&nbsp;This&nbsp;time&nbsp;such&nbsp;a&nbsp;file&nbsp;can&nbsp;be&nbsp;imported&nbsp;co<br>rrectly.&nbsp;Checking&nbsp;these&nbsp;two&nbsp;files(&nbsp;donwloaded&nbsp;in&nbsp;the&nbsp;EM&nbsp;and&nbsp;writen&nbsp;directly)&nbsp;i&nbsp;fo<br>und&nbsp;their&nbsp;sizes&nbsp;are&nbsp;some&nbsp;different.&nbsp;the&nbsp;file&nbsp;written&nbsp;diretly&nbsp;is&nbsp;some&nbsp;larger(&nbsp;it&nbsp;i<br>s&nbsp;larger&nbsp;than&nbsp;the&nbsp;size&nbsp;got&nbsp;from&nbsp;strenlen($backUpData)).&nbsp;So&nbsp;I&nbsp;read&nbsp;the&nbsp;written&nbsp;fil<br>e&nbsp;back&nbsp;again&nbsp;to&nbsp;$backUpData&nbsp;and&nbsp;download&nbsp;it&nbsp;as&nbsp;a&nbsp;file.&nbsp;Now&nbsp;it&nbsp;can&nbsp;be&nbsp;accepted&nbsp;as&nbsp;<br>the&nbsp;correct&nbsp;format.<br><br>So&nbsp;who&nbsp;know&nbsp;what's&nbsp;reason??&nbsp;<br><br><font style='font-size:12pt'>
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