Why can't I save a grib as a *.txt file using ViewFax?
I have installed the latest version available from the developer's website and it's working as it should. However, I have downloaded the beta version and was able to open a GRIB then File > Save as TXT to a custom location. Delete the older version you have installed, and get the new one.
Download URL: http://siriuscyber.net/wxfax/#viewfaxbeta