ID version: 17.1
System: Windows 10
Steps:
1. Double-click an INDD saved by a newer version of ID, perhaps 18, while ID isn't running yet.
2. ID will start, try to open the file and come ip with the conversion dialog. If you then click "Convert", it won't actually convert the file, but do nothing. In this case you would have to close the conversion window and while ID is now running, double-click the INDD again.