hi.

    there are some codes to hash a file before upload it using a ocx.

  js code :

    function CuteWebUI_AjaxUploader_OnSelect(files) {
        alert(document.all("myocx").HashFile(files[0]._internaltask.file1.value));   // files[0]._internaltask.file1.value is E:\\1.txt
        alert(document.all('myocx').HashFile("D:\\1.txt"));                                    // any file not equal upload file

     }

    myocx.HashFile code:

      BSTR CDocEditCtrl::HashFile(LPCTSTR strFileName)
       {
           CFile clsFile;

          if (clsFile.Open(strFileName, CFile::modeRead))
          {
             CString strReturn = "1";
              return strReturn.AllocSysString();
          }
          else
          {
             CString strReturn = "0";
            return strReturn.AllocSysString();
          }
      }

     when run these codes in ie9,ie8,ie7    the js codes will alert '1' , '1' .. every thing is ok.

     but in ie10, will alert '0' , '1' .  [clsFile.Open] return false.

    i send a message by [support] yesterday.  Maybe you will see the same problem.

pls help.