Posted by ubiquitous on
URL: https://forum.librecad.org/dxf-files-open-with-Libre-office-draw-tp5716564p5716684.html

It is almost certainly a Windows 10 issue (especially 1803) where Microsoft seems consistently to alter (reset) some default programs with each update. I am almost convinced it is part of a marketing ploy to lure the unwary into using the App Store to source software (consistent with the current ethos that for consumers "mobile" is where it's at).
Like you, I have failed to make this change, also with .dwg files. I did manage to change .dxf opening from Irfanview (64 bit) to BabaCAD (also 64 bit) and to (finally) get LibreCAD into the 'open with' menu list but 2 hours of making the changes from several points, followed by restarts, have failed dismally.
I have had the issue with other software prior to 1803 and succeeded but not since the advent of 1803.
I am gradually moving my use of open source software to Linux and mainly using  Windows for software that will run on nothing else.
If I find a solution in my wanderings I will certainly post it.