Cannot open *.plt File in linux

[kumo]

Hi, welcome at this forum!

Two positions at Tábor-Všechov Ultralight Airport, right?

I don't have linux, I don't know linux. But just had a problem with your data, too:

I copied your data into a *.txt file and drag&dropped it into RouteConverter and got a message
regarding GPSBabel although I have NOT defined a external GPSBabel in RouteConverter options.

BUT I had the whole GPSBabel package installed at the PC for test purposes, a long time ago.

I uninstalled the GPSBabel package from my PC (RouteConverter has a internal GPSBabel) and
everything was OK. The file with your data was detected. Curious.