All extensions are distributed to users as a special archive (.zip) file with a .crx suffix. Extensions published to the Microsoft Edge Add-ons website are uploaded as .zip files. The publishing process automatically converts the .zip file into a .crx file.
The following two scenarios don't require you to publish your extension in the Microsoft Edge Add-ons website:
Extensions that are distributed using Enterprise policy.
Using unpacked extension directories on a local machine when Microsoft Edge is in developer mode.
In both cases, Microsoft Edge periodically checks extension hosts for new versions of installed extensions and automatically updates them without user intervention.
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Set up an externally installed extension (an extension that doesn't use Partner Center or Microsoft Edge Add-ons website) to automatically update in users' instances of Microsoft Edge.