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Known issue in the current beta. Will be fixed in the next one. (Existing thread for the issue.)
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Check the text viewer setting under Preferences / File Operations / Double-click on Files.
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If you link your account we will try to investigate that on our side. It may turn out to be a problem in the Password Depot shell extension's code, or it could be that it is registered in an unusual way which Opus doesn't handle correctly. The first report we've had so we'd need to investigate to work out whether the problem is us or them.