I created Windows Phone 8.1 Silverlight app, and I can't to upload it into WP store. I want to use Create App Packages tool in Visual Studio 2013 Professional, but it's impossible for Silverlight apps. I read many guides on dev.windows.com. It's necessary to upload only .appx, .appxbundle or .appxupload files, but I have .xap file only in Bin\ARM\Release folder. May anyone help me?
I'm having the same problem, which I just solved. WP8.1 Silverlight application may not be packaged with the "Create App Packages" tool, so you have to perform several operations manually.
The process is described on msdn (https://msdn.microsoft.com/en-us/library/windows/apps/dn655122%28v=vs.105%29.aspx) - First you have to start the submission of the app on your msdn dashboard. - From here, you'll get some informations, such as reserved application name, and several IDs that you have to edit into both WMAppManifest.xml and Package.appxmanifest - Then you can deploy your app (or run the emulator for release) - This last step will create the package you can upload.
来源：https://stackoverflow.com/questions/28254553/how-to-publish-windows-phone-8-1-silverlight-app-to-windows-phone-store