Merged PR 15736: 21390880: Update online documentation for IApplicationAssociationRegistration::SetAppAsDefault

**Parameter changes:**
pszAppRegistryName -> progId: The method now takes in a progId instead of the registered name of the application
pszSet -> extOrUriScheme: Simply a name change

**Behaviorial changes:**
The application's publisher must match the current default's.
The progId's publisher must also match the application's.

Author: BachDinh1994

sdk-api-src/content/shobjidl_core/nf-shobjidl_core-iapplicationassociationregistration-setappasdefault.md

@@ -2,12 +2,12 @@
 UID: NF:shobjidl_core.IApplicationAssociationRegistration.SetAppAsDefault
 title: IApplicationAssociationRegistration::SetAppAsDefault (shobjidl_core.h)
 author: windows-sdk-content
-description: Sets an application as the default for a given type. For more information, see Default Programs. Not intended for use in Windows 8.
+description: Sets an application as the default for a given extension or protocol, provided that the application's publisher matches the current default's. For more information, see Default Programs. Not intended for use in Windows 8.
 old-location: shell\IApplicationAssociationRegistration_SetAppAsDefault.htm
 tech.root: shell
 ms.assetid: 30870adb-793f-404f-809c-1ec34a1f6b82
 ms.author: windowssdkdev
-ms.date: 12/05/2018
+ms.date: 09/17/2019
 ms.keywords: IApplicationAssociationRegistration interface [Windows Shell],SetAppAsDefault method, IApplicationAssociationRegistration.SetAppAsDefault, IApplicationAssociationRegistration::SetAppAsDefault, SetAppAsDefault, SetAppAsDefault method [Windows Shell], SetAppAsDefault method [Windows Shell],IApplicationAssociationRegistration interface, _shell_IApplicationAssociationRegistration_SetAppAsDefault, shell.IApplicationAssociationRegistration_SetAppAsDefault, shobjidl_core/IApplicationAssociationRegistration::SetAppAsDefault
 ms.topic: method
 f1_keywords: 
@@ -52,22 +52,22 @@ ms.custom: 19H1
 ## -description
 
 
-Sets an application as the default for a given type. For more information, see <a href="https://docs.microsoft.com/windows/desktop/shell/default-programs">Default Programs</a>. Not intended for use in Windows 8.
+Sets an application as the default for a given extension or protocol, provided that the application's publisher matches the current default's. For more information, see <a href="https://docs.microsoft.com/windows/desktop/shell/default-programs">Default Programs</a>. Not intended for use in Windows 8.
 
 
 ## -parameters
 
 
 
 
-### -param pszAppRegistryName [in]
+### -param progId [in]
 
 Type: <b>LPCWSTR</b>
 
-A pointer to a <b>null</b>-terminated Unicode string that specifies the registered name of the application.
+A pointer to a <b>null</b>-terminated Unicode string that specifies the application's ProgID.
 
 
-### -param pszSet [in]
+### -param extOrUriScheme [in]
 
 Type: <b>LPCWSTR</b>
 
@@ -78,7 +78,7 @@ A pointer to a <b>null</b>-terminated Unicode string that contains the file name
 
 Type: <b><a href="https://docs.microsoft.com/windows/desktop/api/shobjidl_core/ne-shobjidl_core-associationtype">ASSOCIATIONTYPE</a></b>
 
-One of the <a href="https://docs.microsoft.com/windows/desktop/api/shobjidl_core/ne-shobjidl_core-associationtype">ASSOCIATIONTYPE</a> enumeration values that specifies the type of the application named in <i>pszSet</i>, such as file name extension or MIME type.
+One of the <a href="https://docs.microsoft.com/windows/desktop/api/shobjidl_core/ne-shobjidl_core-associationtype">ASSOCIATIONTYPE</a> enumeration values that specifies the type of the application named in <i>extOrUriScheme</i>, such as file name extension or MIME type.
 
 
 ## -returns
@@ -87,7 +87,7 @@ One of the <a href="https://docs.microsoft.com/windows/desktop/api/shobjidl_core
 
 Type: <b>HRESULT</b>
 
-If this method succeeds, it returns <b xmlns:loc="http://microsoft.com/wdcml/l10n">S_OK</b>. Otherwise, it returns an <b xmlns:loc="http://microsoft.com/wdcml/l10n">HRESULT</b> error code.
+If this method succeeds, it returns <b xmlns:loc="http://microsoft.com/wdcml/l10n">S_OK</b>. Otherwise, it returns an <b xmlns:loc="http://microsoft.com/wdcml/l10n">HRESULT</b> error code. In particular, if the application's publisher doesn't match the default's, this method returns <b xmlns:loc="http://microsoft.com/wdcml/l10n">E_ACCESSDENIED</b>.