Add descriptions to WinRT and .NET pages

Author: alvinashcraft

hub/apps/develop/files/dotnet-files.md

@@ -1,17 +1,21 @@
 ---
 ms.assetid: 5931d63c-6b80-4e47-b371-ee299e308b8e
 title: Access files and folders with Windows App SDK and .NET
-description: Learn about reading and writing files, working with folders, and reading drive and volume information with .NET APIs and the Windows App SDK.
+description: Packaged Windows App SDK apps can leverage .NET APIs for reading and writing files, working with folders, and reading drive and volume information.
 ms.date: 06/16/2023
 ms.topic: article
 keywords: windows 10, windows 11, windows, winui, windows app sdk, dotnet
 ms.localizationpriority: medium
 ---
 # Access files and folders with Windows App SDK and .NET
 
+Packaged Windows App SDK apps can leverage .NET APIs for reading and writing files, working with folders, and reading drive and volume information. Additionally, any packaged desktop app can utilize both WinRT and Win32 APIs in the Windows SDK, as well as the APIs provided in the .NET SDK. This article provides guidance on how to use the .NET `System.IO` APIs to read and write files, manage drives and folders, and work with memory streams to encode or decode string data.
+
 ## Read and write files with .NET APIs
 
-## Working with drives and folders in .NET
+## Manage drives and folders in .NET
+
+## Encode and decode strings with MemoryStream
 
 ## See also
 

hub/apps/develop/files/winrt-files.md

@@ -1,19 +1,21 @@
 ---
 ms.assetid: 385ede76-fb55-4ef4-a16b-3d9ccfc7367a
 title: Access files and folders with Windows App SDK and WinRT APIs
-description: Learn about using WinRT APIs with Windows App SDK apps for reading and writing app settings, file and folder pickers, and special sand-boxed locations such as the Video/Music library.
+description: Packaged Windows App SDK apps can leverage WinRT APIs for reading and writing app settings, file and folder pickers, and special sand-boxed locations such as the Video/Music library.
 ms.date: 06/16/2023
 ms.topic: article
 keywords: windows 10, windows 11, windows, winui, windows app sdk, winrt
 ms.localizationpriority: medium
 ---
 # Access files and folders with Windows App SDK and WinRT APIs
 
+Packaged Windows App SDK apps can leverage WinRT APIs for reading and writing app settings, file and folder pickers, and special sand-boxed locations such as the Video/Music library. Additionally, any packaged desktop app can utilize both WinRT and Win32 APIs in the Windows SDK, as well as the APIs provided in the .NET SDK. This article provides guidance on how to use the WinRT storage APIs to query files and folders, retrieve file properties, and work with the **Pictures** library.
+
 ## Query files and folders
 
 ## Get file properties
 
-## Files and folders in Windows libraries
+## Files and folders in the Pictures library
 
 ## See also