Answered
I have several files I no longer can open in Geogebra classic.
There are no problems opening them in the desktop version (Geogebra 5.0.457.0-d).
But when i try:
- rightclicking the file and choose Geogebra classic
- or start Geogebra classic and choose "Open"
then nothing happens.
I have tried Edge, Internet explorer and chrome
The same question 
The files are slightly corrupted. If you load and re-save them in GeoGebra Classic 5 it seems to fix them!
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