Here is the catch: it does that only when my file's name does not have an extension. For example, when Total commander asks for filename (after I press Shift+F4), I don't enter "name.txt", but only "name".
But it is not a problem for me to access the route file via total commander. I works just fine.
I cannot open them using it. When I do so I get Kurviger error message like this. Screenshot_20210101-235629_Kurviger Pro14402560 387 KB
If you use a modern version of the total; commander (6.52 is the most recent) you will see a new option under "show" that is called "custom columns". If you load the exif plugin that you can download from "ghisler.com" or from "totlacmd.net" you will be able to add columns to the left and/or right panel (you can pick the fields from a list "iso","focallen","shutter speed" etc.).
The fact that the combo-boxes do not seem to work on your system may be solved by using the 145b plugin from totalcmd.net rather than the original from ghisler.com.
If that does not solve it you could try re-installing TC etc.