By default, if you start WinCatalog 2017 without command line parameters, it tries to open most recently opened collection file. If you pass a filename as a single parameter, WinCatalog will try to open it. In other cases, use the -Open command (short version: -o or /o or :o):
-Open "collection filename"
-o "collection filename"
Creating a new Collection File
For creating a new empty collection file use -FileNew (-n). If the file exists, it will be opened without clearing the contents:
-FileNew "collection filename"
-n "collection filename"
The creation and opening commands are mutually exclusive; you can use only one of them at the same time. The opening and creation commands can be combined with other commands (updating, adding, navigation).
