With Navdata API option on and since the last update GSX is creating and recognizing the Navdata ini files, but the filename can not be changed
The filename surely can be changed but, there's a new option that, if a good .INI file has been found, meaning one that matches the navdata perfectly, its name will be SAVED in the [GSX] section of the couatladdons.ini file. This is also in case you have multiple .INI files for the same airport, it will try to use the one matching more parking spots, and if they are both "good", it will allow you to choose one AND it will save your preference.
This means, your .INI file should be renamed before its preference is saved. If you want to fix a file you renamed after it was saved, edit %APPDATA%\Virtuali\Couatladdons.ini and find the line in the GSX section for that airport, for example:
profile_eddf = xxxxx
And change it as you renamed it, setting ONLY the part *after* the dash, not including the dash itself.