In order to address the challenge posed by the data size,
".sflow" is created by the Server only upon request. Flows in Switch installation are a combination of XML and Property sets in various folders. When a user chooses "Export" in Designer UI, the XML and Property sets are combined in .sflow by Server. The logic is difficult to extract outside Server and it is also important to have the tool as an independent application to enable data collection even when Switch is not launched anymore.
Therefore the tool exists in two places: as a functional part of Designer and also as a standalone executable.
The standalone Wizard is called SwitchDataCollector.exe or SwitchDataCollector.app. The standalone Wizard is added into Switch installers (both on Mac and Windows) and can be found near Designer executable/bundle.
The tool is implemented as a wizard. The wizard is placed in a separate library which is used by both the designer and the external executable. When the wizard is invoked from Designer UI (by a menu item) it works in extended mode and allows exporting .sflows. When it is invoked from standalone executable, it does not allow creating ".sflow". It collects raw flow XMLs and Property sets.