With the Windows 3.1 or Windows NT WinNet interfaces , showing dialog boxes for network-specific properties of files was achieved by the File Manager calling the functions WNetGetPropertyText, WNetPropertyDialog, or NPGetPropertyText, NPPropertyDialog respectively.
In Windows 95, this function is achieved by the NP hooking the Windows 95 Shell Extension mechanism for providing additional property sheet pages.
Clearly, the NP should show only properties for files associated with its own network.