The FlexPro Application.FileDialog can only be used to select existing files (or folders), i.e. entering a non-existing filename results in an error message.

So it is recommended to use the GetOpenFileName / GetSaveFileName methods in general. If the code should be compatible with both 32 and 64 bit VBA one has to cope with the different signatures and data structures used. You may find some information on this VBA topic under http://www.jkp-ads.com/articles/apideclarations.asp