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I know how to load unpacked Microsoft Edge extension.
Now I have my extension packed (but not signed yet) to a .appx file. Can I load the extension via the .appx file?
I tried to open the .appx file by double-click on it, it shows:
Installation failed
Reason: This one isn't signed with a trusted certificate.
Yes, you can install an Edge extension from a package, but it must be signed by the certificate which should be added to the trusted people store as described in the documentation. Well, I see, that you have a problem with signing, so you can try to use this extension sample, which contains .bat file to build a package and sign it (Visual Studio 2015 is required - see the second line of build.bat). I have published this sample to report about the bug. Hope this will help you.