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@DJ2Tech I've talked with the store team and confirmed this. Here is the information that we could share.
First, if you want to publish EXE/MSI apps, you will need to implement pricing & payment mechanism within your app by yourself. Currently, there is no official payment or pricing mechanism for EXE/MSI apps in the store. The app you found in the store should be MSIX apps. The price model option in the Availability Page is more like a note to the users.
Second, if your app has implemented pricing, payment is not processed through the Store like MSIX apps, you will need to work with a third-party payment service.
Thank you.
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