Hello, try this the verify the extension (on the command line):
or better:
$ code --list-extensions --show-versions
The 1st command should report fourjs.genero-fgl, the 2nd command should also report the version of the extension.
Notice: The extension will be activated when opening a .4gl or a .per file in the editor:
Activation status after opening a .4gl file:
Activation Event:onLanguage:4gl
Activation Time:166ms