No it's not just a worthless extra file.
This is the file that holds all the assembly configuration information.(I'm not sure if it's just display configs)
If you save different configs the info will be stored here.
If you then delete it all those configs will be lost.
The reason its being shown as a Microsoft Outlook file is because that's how Windows is set to recognise the .cfg file extension.
bc.
2.4GHz Core2 Quad, 4GB RAM,
Quadro FX4600.
Where would we be without sat-nav?