The gathering of ports on Desktop/Windows is done by executing 'netstat' (see DesktopPortsGatheringMethod). However, at least on Windows, the command needs to be set with complete path (e.g. C:\Windows\System32\NETSTAT.EXE). Otherwis it fails, as it currently does.
Qt Creator debug output:
QtcProcess::start: Empty environment set when running 'netstat'.
Application output, when trying to launch a WebAssembly project.
13:19:18: Checking available ports...
13:19:18: Connection error: The program "" does not exist or is not executable.