To run an msixbundle, don’t ‘open’ it – install it. And if Windows asks ‘how to open’, get the free App Installer first.

Jordan’s new laptop arrived with Windows 11, but the company’s custom calculator app (required for billing fractions of design hours) was missing. IT had sent a file: CompanyCalc.msixbundle .

Jordan double-clicked it. Windows asked, “How do you want to open this?” Panic set in. Jordan emailed Alex: “The file won’t run. What’s an msixbundle?”

Jordan installed ‘App Installer’ from the Store (30 seconds). Double-clicked CompanyCalc.msixbundle . A proper installer window opened. Clicked ‘Install’. The calculator appeared in the Start menu within 10 seconds.