Hi, thanks for the info.
OK, when I save it using the command line, it automatically saves it with the correct extension
ie if I type in
flirc_util saveconfig ~/Desktop/my_flirc_config
it saves the config file as "my_flirc_config.fcfg"
The good news is that this file is now automatically listed by the GUI, & by manually renaming the other backup configs that I've done, they now show up too. I haven't actually loaded one of the files though, as my flirc is doing nearly everything that I need it to currently.