MSI-only Features

Everything in this section lives inside the msi: { … } block of your package. None of these properties have an MSIX equivalent.

Each capability has its own page so you can jump straight to the one you need.

#	Page	What you configure
1	Upgrade Codes	upgradeCode, secondaryUpgradeCodes – product identity across versions
2	CAB Configuration	cabName, cabSizeInBytes – how the produced MSI is laid out
3	Properties	properties – custom MSI properties for conditions, dialogs, custom actions
4	INI Files	iniFiles – create / modify INI files at install time
5	Custom Actions	customActions – EXE / DLL / RegSvr / PowerShell / driver / set-property
6	Install Dialog	installDialog – branded MPDEV install dialog
7	Detect Running Processes	detectRunningProcesses – tell users to close apps before install
8	Package Dependencies	packageDependencies – pre-install dependency checks (with optional WinGet install)
9	Auto-Updater: How It Works	updater – how the auto-updater works, architecture, security model
9b	Auto-Updater: Configuration	updater – configuration, feed design, install-time overrides, troubleshooting
10	Base MSI	baseMsi – use a custom MSI template as the build base

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Quick orientation

A complete msi: { … } block can mix all of the above. The shape is:

"msi": {
  "upgradeCode":            "{GUID}",
  "secondaryUpgradeCodes":  [ /* ... */ ],
  "baseMsi":                "templates\\Base.msi",
  "cabName":                "#Disk.cab",
  "cabSizeInBytes":         314572800,

  "properties":             [ /* ... */ ],
  "iniFiles":               [ /* ... */ ],
  "customActions": {
    "exe":            [ /* ... */ ],
    "dll":            [ /* ... */ ],
    "registerDll":    [ /* ... */ ],
    "powershell":     [ /* ... */ ],
    "installDriver":  [ /* ... */ ],
    "setProperty":    [ /* ... */ ]
  },
  "installDialog":          { /* ... */ },
  "detectRunningProcesses": [ /* ... */ ],
  "packageDependencies":    [ /* ... */ ],
  "updater":                { /* ... */ }
}

Pick whatever subset your installer needs and ignore the rest – every property is optional unless explicitly noted on its page.