Use a form alias on the form you want to use and then rename the old form. For example,
If you want to use NewForm then call it as follows. The name is NewForm, and it will use the alias of NewForm but also use oldform when it searches for a form to open a document with.
NewForm|oldform|NewForm
Feedback response number HDGG8TMS3J created by Howard D Greenberg on 04/23/2012