title: InvokeProcess custom activity does not invoke
body: <p>I'm doing my first steps on Customizing the TFS builds. I created an InvokeProcess that calls a batch file. I see in the log that the batch file is called, but I do not see that the batch file is executed. In the FileName I put the located and the name of the file (for example "C:\myBatch.bat".
  Just to see it working, I called in the file name also "Notepad.exe" and also it did not work.
  What can be the problem?</p>
  
  <p>Thanks</p>