Recently, I was trying to adjust some settings to make my movements in Opus faster. This was just changing where folders were placed, etc. I don't believe I did anything to file paths. After that I have now found that trying to open a .tcf file by double clicking in Opus will not open in VS Code, even though it is set as the default program to open .tcf files.
I tried uninstalling and reinstalling Opus. Currently on 12.31 x64 and the issue still persists on a fresh install.
I can open the file using the Right click>Open With VS Code option and it opens in VS Code just fine.
I'm not sure exactly what else you need from me but I can try to provide anything.