To publish a Desktop app in the Store, there are some steps you need to figure out.
1.You need a developer account to publish your app to the Microsoft Store, please refer to Opening a developer account
2.Reserve an app name in your Windows Dev Center dashboard
3.Package your application
1).Package your project with VS(can refer to the small video at the buttom of the document)
2).Or package a desktop application manually
4.Start your App submission in Dev center dashboard
(1)Set app pricing and availability
(2)Enter app properties
(3)Fill the age rating questionnaire
(4)Upload app packages, for your desktop bridge app, when you upload the package, there will be a note for you,do not worry,you just need to fill the information in the submission page(I will point it in the step 6),the note is as the picture shown:
(5)Create app Store listings
(6)Manage submission options, please fill the requirement information for the restricted capabilities
5.Submit to the Store
Note : Once the developer submits the app on the Dev Center, it must be certified also by the Store team. Currently, all the Desktop Bridge apps are processed only through a manual certification process, which may take up to 5 business days.