winapp-setup

Development

Set up a Windows app project for MSIX packaging, Windows SDK access, or Windows API usage. Use when adding Windows support to an Electron, .NET, C++, Rust, Flutter, or Tauri project, or restoring SDK packages after cloning.

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How to use this skill

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Source SKILL.md: https://github.com/microsoft/winappCli/blob/HEAD/.claude/skills/winapp-setup/SKILL.md

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When to use

Use this skill when:

Adding Windows platform support to an existing project (Electron, .NET, C++, Rust, Flutter, Tauri, etc.)
Cloning a repo that already uses winapp and need to restore SDK packages
Updating SDK versions to get the latest Windows SDK or Windows App SDK

Prerequisites

Install the winapp CLI before running any commands:

# Via winget (recommended for non-Node projects)
winget install Microsoft.WinAppCli --source winget

# Via npm (recommended for Electron/Node projects — includes Node.js SDK)
npm install --save-dev @microsoft/winappcli

You need an existing app project — winapp init does not create new projects, it adds Windows platform files to your existing codebase.

Already have a Package.appxmanifest? .NET projects that already have a packaging manifest (e.g., WinUI 3 apps or projects with an existing MSIX packaging setup) likely don't need winapp init. Ensure your .csproj references the Microsoft.WindowsAppSDK NuGet package and has the right properties for packaged builds (e.g., <WindowsPackageType>MSIX</WindowsPackageType>). WinUI 3 apps created from Visual Studio templates are typically already fully configured — you can go straight to building and using winapp run or winapp package.

Key concepts

Package.appxmanifest is the most important file winapp creates — it declares your app's identity, capabilities, and visual assets. Most winapp commands require it (package, run, cert generate --manifest).

winapp.yaml is only needed for SDK version management via restore/update. Projects that already reference Windows SDK packages (e.g., via NuGet in a .csproj) can use winapp commands without it.

.winapp/ is the local folder where SDK packages and generated projections (e.g., CppWinRT headers) are stored. This folder is .gitignored — team members recreate it via winapp restore.

Usage

Initialize a new winapp project

# Interactive — prompts for app name, publisher, SDK channel, etc.
# Automatically searches for compatible projects (Tauri, Electron, .NET, Rust, C++, Flutter)
winapp init

# Non-interactive — accepts all defaults (stable SDKs, current folder name as app name)
winapp init . --use-defaults

# Non-interactive with JS bindings enabled
winapp init . --use-defaults --add-js-bindings

# Skip SDK installation (just manifest + config)
winapp init . --use-defaults --setup-sdks none

# Install preview SDKs instead of stable
winapp init . --use-defaults --setup-sdks preview

After init, your project will contain:

Package.appxmanifest — package identity and capabilities
Assets/ — default app icons (Square44x44Logo, Square150x150Logo, etc.)
winapp.yaml — SDK version pinning for restore/update
.winapp/ — downloaded SDK packages and generated projections
.gitignore update — excludes .winapp/ and devcert.pfx

When JS bindings are enabled (via --add-js-bindings or by answering yes in interactive init), npm/Electron projects also get:

.winapp/bindings/ — generated JS bindings for Windows App SDK APIs (npm-only, Node / Electron)
package.json update — adds the winapp.jsBindings namespace and @microsoft/dynwinrt dependency (npm-only)

Restore after cloning

# Reinstall SDK packages from existing winapp.yaml (does not change versions)
winapp restore

# Restore into a specific directory
winapp restore ./my-project

Use restore when you clone a repo that already has winapp.yaml but no .winapp/ folder.

Update SDK versions

# Check for and install latest stable SDK versions
winapp update

# Switch to preview channel
winapp update --setup-sdks preview

This updates winapp.yaml with the latest versions and reinstalls packages.

Run and debug with identity

# Register debug identity and launch app from build output
winapp run ./bin/Debug

# Launch with custom manifest and pass arguments to the app
winapp run ./dist --manifest ./out/Package.appxmanifest --args "--my-flag value"

# Pass arguments after -- to avoid escaping (equivalent to --args)
winapp run ./bin/Debug -- --my-flag value

# Register identity without launching (useful for attaching a debugger manually)
winapp run ./bin/Debug --no-launch

# Launch and capture OutputDebugString messages and crash diagnostics
# Note: prevents other debuggers (VS, VS Code) from attaching — use --no-launch if you need those instead
winapp run ./bin/Debug --debug-output

Use winapp run during iterative development — it creates a loose layout package, registers a debug identity, and launches the app in one step. For identity-only registration without loose layout, use winapp create-debug-identity instead.

Choosing between `run` and `create-debug-identity`

	`winapp run`	`create-debug-identity`
Registers	Full loose layout package (entire folder)	Sparse package (single exe)
App launch	Winapp launches via AUMID or alias	You launch the exe yourself
Simulates MSIX	Yes — closest to production	No — identity only
Files	Copied to AppX layout dir	Exe stays in place
Best for	Most frameworks (.NET, C++, Rust, Flutter, Tauri)	Electron, or F5 startup debugging

Default to winapp run. Use create-debug-identity when you need your IDE to launch and debug the exe directly (startup debugging), or when the exe is separate from your source (Electron).

For console apps, add --with-alias to preserve stdin/stdout in the current terminal.

--debug-output caveat: Captures OutputDebugString and crash diagnostics (minidump + automatic analysis for both managed and native crashes) but attaches winapp as the debugger — you cannot also attach VS Code or WinDbg. Use --no-launch if you need your own debugger. Add --symbols to download PDB symbols for richer native crash analysis. For WinUI 3 apps, a stowed-exception triage pass runs automatically (surfacing the originating HRESULT and native XAML dispatch stack); the debugger components it needs are downloaded on first use, or set WINAPP_DBGTOOLS_DIR to a directory containing dbgeng.dll and JsProvider.dll for offline/locked-down environments.

For full debugging scenarios and IDE setup, see the Debugging Guide.

Recommended workflow

Initialize — winapp init . --use-defaults in your existing project
Configure — edit Package.appxmanifest to add capabilities your app needs (e.g., runFullTrust, internetClient)
Build — build your app as usual (dotnet build, cmake, npm run build, etc.)
Run with identity — winapp run ./bin/Debug to register identity and launch for debugging
Package — winapp package ./bin/Release --cert ./devcert.pfx to create MSIX

Tips

Use --use-defaults (alias: --no-prompt) in CI/CD pipelines and scripts to avoid interactive prompts. Non-interactive environments (piped stdin, CI runners) are auto-detected and will use defaults automatically with a warning.
If you only need Package.appxmanifest without SDK setup, use winapp manifest generate instead of init
winapp init is idempotent for the config file — re-running it won't overwrite an existing winapp.yaml unless you use --config-only
For Electron projects, prefer npm install --save-dev @microsoft/winappcli and use npx winapp init instead of the standalone CLI

Related skills

After setup, see winapp-manifest to customize your Package.appxmanifest
Ready to package? See winapp-package to create an MSIX installer
Need a certificate? See winapp-signing for certificate generation
Not sure which command to use? See winapp-troubleshoot for a command selection flowchart

Troubleshooting

Error	Cause	Solution
"winapp.yaml not found"	Running `restore`/`update` without config	Run `winapp init` first, or ensure you're in the right directory
"Directory not found"	Target directory doesn't exist	Create the directory first or check the path
SDK download fails	Network issue or firewall	Ensure internet access; check proxy settings
`init` prompts unexpectedly in CI	Missing `--use-defaults` flag	Add `--use-defaults` to skip all prompts (note: non-interactive shells are now auto-detected)

Command Reference

`winapp init`

Start here for initializing a Windows app with required setup. Sets up everything needed for Windows app development: creates Package.appxmanifest with default assets, downloads Windows SDK and Windows App SDK packages, and generates projections. When SDK packages are managed (--setup-sdks stable/preview/experimental), also creates winapp.yaml to pin versions for 'restore'/'update'; with --setup-sdks none (e.g., for Rust/Tauri projects that bring their own SDK bindings), no winapp.yaml is created. Interactive by default; automatically uses defaults in non-interactive environments (use --use-defaults to skip prompts explicitly). Use 'restore' instead if you cloned a repo that already has winapp.yaml. Use 'manifest generate' if you only need a manifest, or 'cert generate' if you need a development certificate for code signing.

Arguments

Argument	Required	Description
`<base-directory>`	No	Base/root directory for the winapp workspace, for consumption or installation.

Options

Option	Description	Default
`--config-dir`	Directory to read/store configuration (default: the selected project directory, or current directory if no project is detected)	(none)
`--config-only`	Only handle configuration file operations (create if missing, validate if exists). Skip package installation and other workspace setup steps.	(none)
`--ignore-config`	Don't use configuration file for version management	(none)
`--no-gitignore`	Don't update .gitignore file	(none)
`--setup-sdks`	SDK installation mode: 'stable' (default), 'preview', 'experimental', or 'none' (skip SDK installation)	(none)
`--use-defaults`	Do not prompt; requires an explicit project directory (e.g., winapp init . --use-defaults)	(none)

`winapp restore`

Use after cloning a repo or when .winapp/ folder is missing. Reinstalls SDK packages from existing winapp.yaml without changing versions. Requires winapp.yaml (created by 'init'). To check for newer SDK versions, use 'update' instead.

Arguments

Argument	Required	Description
`<base-directory>`	No	Base/root directory for the winapp workspace

Options

Option	Description	Default
`--config-dir`	Directory to read configuration from (default: current directory)	(none)

`winapp update`

Check for and install newer SDK versions. Updates winapp.yaml with latest versions and reinstalls packages. Requires existing winapp.yaml (created by 'init'). Use --setup-sdks preview for preview SDKs. To reinstall current versions without updating, use 'restore' instead.

Options

Option	Description	Default
`--setup-sdks`	SDK installation mode: 'stable' (default), 'preview', 'experimental', or 'none' (skip SDK installation)	(none)

`winapp run`

Creates packaged layout, registers the Application, and launches the packaged application.

Arguments

Argument	Required	Description
`<input-folder>`	Yes	Input folder containing the app to run
`<app-args>`	No	Arguments to pass to the launched application. Provide after -- (e.g., winapp run . -- --flag value).

Options

Option	Description	Default
`--args`	Command-line arguments to pass to the application. Alternatively, use -- followed by arguments to avoid escaping (e.g., winapp run . -- --flag value).	(none)
`--clean`	Remove the existing package's application data (LocalState, settings, etc.) before re-deploying. By default, application data is preserved across re-deployments.	(none)
`--debug-output`	Capture OutputDebugString messages and first-chance exceptions from the launched application. Only one debugger can attach to a process at a time, so other debuggers (Visual Studio, VS Code) cannot be used simultaneously. Use --no-launch instead if you need to attach a different debugger. For WinUI apps, a crash also triggers a stowed-exception triage pass; the first run downloads debugger components (cached under the winapp global directory) and can be pointed at an existing debugger install via the WINAPP_DBGTOOLS_DIR environment variable. Cannot be combined with --no-launch or --json.	(none)
`--detach`	Launch the application and return immediately without waiting for it to exit. Useful for CI/automation where you need to interact with the app after launch. Prints the PID to stdout (or in JSON with --json).	(none)
`--executable`	Path to the executable relative to the input folder. Use to disambiguate when the manifest contains a $targetnametoken$ placeholder and multiple .exe files are present in the input folder.	(none)
`--json`	Format output as JSON	(none)
`--manifest`	Path to the Package.appxmanifest (default: auto-detect from input folder or current directory)	(none)
`--no-launch`	Only create the debug identity and register the package without launching the application	(none)
`--output-appx-directory`	Output directory for the loose layout package. If not specified, a directory named AppX inside the input-folder directory will be used.	(none)
`--symbols`	Download symbols from Microsoft Symbol Server for richer native crash analysis, including the WinUI stowed-exception dispatch stack. Only used with --debug-output. First run downloads symbols and caches them locally; subsequent runs use the cache.	(none)
`--unregister-on-exit`	Unregister the development package after the application exits. Only removes packages registered in development mode.	(none)
`--with-alias`	Launch the app using its execution alias instead of AUMID activation. The app runs in the current terminal with inherited stdin/stdout/stderr. Requires a uap5:ExecutionAlias in the manifest. Use "winapp manifest add-alias" to add an execution alias to the manifest.	(none)

How to use this skill

When to use

Prerequisites

Key concepts

Usage

Initialize a new winapp project

Restore after cloning

Update SDK versions

Run and debug with identity

Choosing between run and create-debug-identity

Recommended workflow

Tips

Related skills

Troubleshooting

Command Reference

winapp init

Arguments

Options

winapp restore

Arguments

Options

winapp update

Options

winapp run

Arguments

Options

Choosing between `run` and `create-debug-identity`

`winapp init`

`winapp restore`

`winapp update`

`winapp run`