How to find the install program path from jsp?

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Javascript

IE

JSP

HTML5

When user visit my website and click the button,I want to start the Postman.exe.So I have to find the Postman install path.I have used the ocx and regedit commond to find the install path.But if the program do not write the infomation to the registry,How to find and start the program? Can I use the bat command?

function exec () {  
var command;  
var shell = new ActiveXObject("WScript.Shell"); 
try
{
    command = shell.RegRead("HKEY_LOCAL_MACHINE\\SOFTWARE\\Classes\\Directory\\shell\\RadiAnt\\Icon");
}
catch(e)
{
    if(window.confirm("你可能还没有安装Radiant，请下载安装")){
        //alert("确定");
         window.location.href="jspView/radiantsetup32312921.exe";
         return false;
     }else{
        return false;
    }
}//执行exe程序
    window.oldOnError = window.onerror;  
    window._command = command;  
    window.onerror = function (err) {  
  if (err.indexOf('utomation') != -1) {  
    alert('命令' + window._command + ' 已经被用户禁止！');   
    return true;  
   }  
   else return false;  
 };  
 var wsh = new ActiveXObject('WScript.Shell');  
 if (wsh)  
 wsh.Run("\""+command); 
 window.onerror = window.oldOnError;
}  

What I have tried:

I have try to use the ocx.But if the program do not write the infomation to the registry,How to find and start the program?