IF the indesign CC is last installed vesion on your windows it will be the default program.
Did you uninstall a previous version after installing CC? This is a typical symptom of that.
To fix this the easiest method is generally to uninstall and reinstall ID.
I'm having the same issue.
I did not uninstall a previous version after installing CC, and CC was the most recent version of InDesign I installed (and I believe there's been at least 2 InDesign CC updates that I've installed since the initial installation).
I've browsed to the InDesign exe, as sc_rpa did in #1 above, and it never gets added to the application list.
I've tried going through the control panel, same thing.
I've uninstalled and reinstalled InDesign (several times, now)... and just can't get it to work. For some reason, it's as if Windows thinks InDesign.exe is not a true executable/application.
It's really affecting convenience and efficiency for me, not being able to open my .indd files directly from the file manager.
Has anybody figured this out, yet?
I'm on the 64-bit Windows 7, if that might make a difference.
Same problem. My associations worked after installing CC 2015. I accepted an InDesign update and they broke. They still work for other CC applications. Similar experiences to Carl above. I also tried the regedit solution, but no luck. The only path I have not yet followed is to use the CC Cleaner after uninstall. Seems like a boatload of trouble for simply accepting an update!
Adobe, is this really an isolated problem? Very frustrating.
Later. I tried Adobe CC Cleaner tool without success. Within the tool, InDesign was not listed as a choice of an application to be cleaned.