I have installed OSGeo4W following this: Installing QGIS with FileGDB?
Now I have QGIS Desktop 3.8.3 and gdal-filegdb 2.4.1-1 installed on windows 10.
I open directory that include the following file extensions: gdbindexes, gdbtable, gdbtablx, spx, atx, freelist , selecting ESRI FileGDB as described here too Installing File Geodatabase (*.gdb) support in QGIS?
Error "Invalid data source" is displayed.
How to open these files in QGIS?