Default file extension
Member of Open File Dialog (PRIM_APPL.ICommonDialogFileOpen)
Data Type - String
Use the DefExtension to specify the extension to be appended to the file name if the user fails to type an extension. This string can be any length, but only the first three characters are appended. The string should not contain a period (.). If this property does not have a value and the user fails to type an extension, no extension is appended.
Febuary 18 V14SP2