WinAPI::fileExists(tmpFile))//FILE not found error in batch

I have below code and dont ask why in batch the Bindata.loadfile has a file not found error

Yes i did full compile full CILL restart aos service.

code is running client site without any issues (AX 2012R3 latest binaries)

private container saveToLog(str _jsonstring)
{
  TextIo textIo;
  BinData binData = new BinData();

  FileIOPermission permission;
  str tmpFile;
  if(isRunningOnServer())
  {
    info('server');
    tmpFile = WinAPIServer::getTempPath()+guid2str(newGuid())+ '.json';
  }
  else
  { 
    info('client');
    tmpFile = WinAPI::getTempPath()+guid2str(newGuid())+ '.json';
  }

  permission = new FileIOPermission(tmpFile, 'RW');
  permission.assert();

  textIo = new TextIo(tmpFile,"W");
  textIo.write(_jsonstring);

  textIo = null;
  if(isRunningOnServer())
  {
    if(WinAPIServer::fileExists(tmpFile))
    {
      info('found');
    }

  else
  {
    info('not found');
  }
}
else
{
  if(WinAPI::fileExists(tmpFile))
   {
      info('found');
  }
  else
  {
       info('not found');
  }
}
if( binData.loadFile(tmpFile))//FILE not found error in batch
{
  return binData.getData();
}
if(isRunningOnServer())
{
   WinAPIServer::deleteFile(tmpFile);
}
else
{
   WinAPI::deleteFile(tmpFile);
}
return conNull();
}