Steps to reproduce:

• Go to Windows Explorer
• select an add-on file (with .nvda-addon extension)
• Press enter

Actual behavior:

Nothing happens. No vocal feedback. The selected file in Windows explorer keeps the focus.
No information in the log other than the 'Enter' key press.

Expected behavior:

The add-on installation window opens.

Note

I have tested the various commits (running NVDA from source) and have found that the commit responsible for this regression is ae4ea8f. It was introduced by PR #9079.
Cc @LeonarddeR

System configuration

NVDA installed/portable/running from source:

From source or portable or temporary copy (run from installer).
Did not try to install this version.

NVDA version:

Version : source-master-001c99b

Windows version:

10

Name and version of other software in use when reproducing the issue:

N/A

Other information about your system:

N/A

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

If addons are disabled, is your problem still occuring?

Yes

Did you try to run the COM registry fixing tool in NVDA menu / tools?

No