Now checked the file using Android Navigator free. The file can be opened unter "Import" and entries can be selected.
I did not manage to have all the entries just to be displayed on the map. That is, what I need (maybe I do not remember correctly or mix it up - thougt, I used the navigator like that some years ago).
I still did not manage to have the file shown in the PC-Version.
Deleted everything and installed from zero - now the Navigator 22.
Set a path to install the maps INSIDE the programfolder. Created a new CSV-file - digger saved it to it's "import"-folder.
Tried to copy the file to the maps-folder, but this folder was not shown in Windows.
Had Windows find the ".mca"-files.
Had Windows open the folder - it did. Opened the explorer in another window and moved the .mca-file to den maps-folder. That worked. The file is now found in the "imported"-Menu.