Redmine

Hi,
Help me

How can i upload a file from my local machine to an issue in redmine??

language: ASP, VBA

When i upload a file with the code below, the application create a file with a text.

RequestURL1 = "http://link/issues/77621.xml?key=590fe11527aa9e185539050a5d0d3c72aa8c6d6d" 
          Set xhr = CreateObject("MSXML2.XMLHTTP.6.0")    
          xhr.Open "PUT", RequestURL1, False
          xhr.SetRequestHeader "Content-Type", "text/xml" 
          RequestBody = "<?xml version=" & Chr(34) & "1.0" & Chr(34) & "?>" 
          RequestBody = RequestBody & "&lt;issue&gt;" 
          RequestBody = RequestBody & "&lt;id&gt;" & "77621" & "&lt;/id&gt;" 
          RequestBody = RequestBody & "&lt;uploads type='array'&gt;" 
          RequestBody = RequestBody & "&lt;upload&gt;" 
          RequestBody = RequestBody & "&lt;token&gt;"& token.text &"&lt;/token&gt;" 
          RequestBody = RequestBody & "&lt;filename&gt;teste.txt&lt;/filename&gt;" 
          RequestBody = RequestBody & "&lt;description&gt;Teste Anexo&lt;/description&gt;" 
          RequestBody = RequestBody & "&lt;content_type&gt;application/txt&lt;/content_type&gt;" 
          RequestBody = RequestBody & "&lt;/upload&gt;" 
          RequestBody = RequestBody & "&lt;/uploads&gt;"        
          RequestBody = RequestBody & "&lt;/issue&gt;"