title: Find Install directory and working directory of VSTO Outlook Addin; or any Office Addin
body: <p>I created a VSTO Outlook Addin that uses a library Html2Xhtml.dll (.NET) which calls another Html2xhtml.exe by executing System.Diagnostic.Process.Start().</p>
  
  <p>However, it fails to call Html2xhtml.exe (i think) because the working directory even when launched from Visual Studio is the current user My Documents folder. I have no control over the code in Html2Xhtml.dll so I cannot use absolute path; but I suppose I can change the working directory of the Add-in at runtime.</p>
  
  <p>However, If I install this via ClickOnce or some other means where I do not know the install path the user is going to choose, how am I suppose to find my Html2xhtml.exe? </p>