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I think it might be possible editing some settings on the registry. Can anyone tell me what I have to edit? So the shell methods will be the same for RAR and XPI files...

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up vote 1 down vote accepted

Open Winrar's Options > Settings > Integration tab. Inside the "User defined archive extensions" box, type .XPI and click OK. Windows 7 will request your permission to change system settings. Click Yes and you're done.

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Wow, perfect. Exactly what I was looking for. Thank you. – BrunoLM Dec 23 '10 at 18:44
Glad to help. You're welcome. – Mehper C. Palavuzlar Dec 23 '10 at 20:28

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