He had the package. But in the world of Windows apps, an unsigned package is like a sealed envelope with no name on it—it won't be opened by anyone.
He needed Signtool.exe (a story for another day), but he was in the zone. He signed the MSIX with his test certificate.
signtool sign /fd SHA256 /a MyApp.msix
"Successfully signed."
The MakeAppx.exe tool is a command-line utility used to create app packages (.appx or .msix) from files on a disk or to extract files from an existing package. It is officially provided by Microsoft and is not available as a standalone download; instead, it is bundled with major development kits. Official Sources for MakeAppx.exe download makeappx.exe
To obtain a legitimate copy of MakeAppx.exe, you should download one of the following official Microsoft packages:
Windows SDK: The most common way to get the tool. You can download the latest version for Windows 10 or 11 from the official Windows SDK download page.
Visual Studio: It is automatically included when you install the "Universal Windows Platform development" workload in Visual Studio. He had the package
MSIX Packaging Tool: A more lightweight alternative. You can download this from the Microsoft Store. Once installed, the SDK tools like makeappx.exe are contained within its installation directory. Common File Locations
After installation, you can typically find the executable at these paths:
Standard SDK Path: C:\Program Files (x86)\Windows Kits\10\bin\. "Successfully signed
App Certification Kit: C:\Program Files (x86)\Windows Kits\10\App Certification Kit\makeappx.exe. Core Commands The tool is primarily used for the following operations:
Pack: Create an app package from a folder (MakeAppx pack /d ).
Unpack: Extract the contents of a package (MakeAppx unpack /p ).
Bundle: Combine multiple architecture-specific packages into a single bundle (.appxbundle or .msixbundle).
| Aspect | Detail |
|--------|--------|
| Official Source | Windows SDK (part of Windows Kits) |
| Download Link | Windows SDK |
| Install Size | ~2-3 GB (full SDK) |
| Tool Location | %ProgramFiles(x86)%\Windows Kits\10\bin\<version>\x64\ |
| Primary Use | Create .appx / .msix packages |