How To Reset the Default EditFormUrl, NewFormUrl and DispFormUrl of a SharePoint ContentType
When you want to change the EditFormUrl, NewFormUrl and DispFormUrl of a SharePoint ContentType, you can do this by including a section in your ContentType Xml Declaration or do it in code (recommended). It is also possible to reset those Urls so that the default SharePoint form is loaded when editing, creating or displaying a listitem of that content type.