Not working with Eclipse Theia

[chroberino]

Description

I don't get any context menu items when using this extension with Eclipse Theia. I have tried with both, the latest ready-made beta version of "Theia IDE" (Windows) as well as a self-built Electron app based on Theia 1.45.0 (Windows), but it is the same behaviour in both: after installing the "Open in External App" extension from the Open VSX Registry I don't get the option to open files in the default external app.

Extension Version

0.10.0

VS Code Version

1. Eclipse Theia IDE 1.47.100
2. Eclipse Theia 1.45.0 sources

Extension Settings

No config, just want to use the default application as configured in the OS.

Logs, Notifications, Screenshots, Screen Recording etc

There is no "Open in External App" channel in the Output panel.

[tjx666]

Other vscode extensions can be used in eclipse theia?

Did you set theia correctlly as described in https://theia-ide.org/docs/authoring_vscode_extensions#prerequisites-for-running-vs-code-extensions-in-theia?

[chroberino]

Other vscode extensions can be used in eclipse theia?

Did you set theia correctlly as described in https://theia-ide.org/docs/authoring_vscode_extensions#prerequisites-for-running-vs-code-extensions-in-theia?

Yes, I can confirm that other extensions (both pre-bundled with my self-built Theia as well as those installed via Open VSX Registry) are working. Actually I can even see the settings of the "Open in External App" extension within Theia. And also the command palette reveals the extension is installed. Please see screenshots.
However, the conext-menu item when right-clicking on a file in the Explorer is missing.

[chroberino]

Just FYI: eclipse-theia/theia#13535
The vscode.env.openExternal call in Theia is also not working as expected.