Hello,
Welcome to Microsoft Q&A!
Can I package an SDL desktop application (.exe) with MSIX package tool?
Yes, the MSIX package tool could create an MSIX application package from the .exe installer. But you need to check the requirements first: Know your installer.
Can I upload such a package to the Microsoft Store?
Yes, if you had generated an MSIX package, you could upload this package to the Store. Currently, MSIX installation through the Microsoft Store and Microsoft Store for Business requires Windows 10, version 1809, and later. But you need to register a developer account first.
Is the app manifest automatically included?
You don't need to check this. The MSIX package tool will generate an MSIX package and you could directly upload it to the store without modification.
For other questions, please check this document: Create an MSIX package from any desktop installer. And you could ask questions about the MSIX package tool here: MSIX developer forum.
Thank you.
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