Issue starting Kconfig in VS code, getting can't decode byte 0x90 in position 850: character maps to

[IvanR]

Im trying to start Kconfig from VS code but Im getting this error:

Kconfig tree parse failed: 'charmap' codec can't decode byte 0x90 in position 850: character maps to <undefined>

??

Tried saving it as different encodings, but no joy. 

Regards,