I have recently upgraded to Studio 2019 on my laptop.
The XML (ST4 schema) files are no longer converted correctly, although this worked once!
I have tried importing several XML (ST4 schema) files that were converted correctly with Studio 2017 - they are always converted as XML: Any v 1.2.0 even though I have deactivated the associated checkbox! Does anyone have an explanation for this behavior?
PS I have reimported the ST4 settings and double-checked that they are activated.
It would appear that "old" file settings are being "cached".
Jerzy Czopki brought me on the path to solving the problem; the associated template settings had the wrong file settings assigned, unfortunately the current file settings cannot be browsed.