#post-id: 5442-21-31
#original-date: 20.06.2015 Sat
#original-time: 9:31 PM
#original-day:  5442
#original-host: WinXP Home SP3 (Build 2600)

Почему богу понадобилось всего семь дней чтобы создать мир?

> * Why does the class name for Explorer change depending on whether 
>   you open it with /e? *
> 
> I noted some time ago that Explorer's original name was Cabinet, 
> and that the name lingers in the programmatic class name: 
> Cabinet­WClass. A commenter with a rude name points out that 
> Explorer uses the class name Explorer­WClass if you open it with 
> the /e command line switch, adding, "This is rather strange since 
> you can toggle the folder pane on/off in the UI either way."
> 
> In Windows 95, the window class names for Explorer were 
> Cabinet­WClass for plain Explorer windows and Explorer­WClass for 
> windows opened in Explore mode with the folder tree view thingie 
> on the left hand side. This was not strange at the time because 
> there were two different types of Explorer windows, and there was 
> no way to change between them. The UI to toggle the folder pane 
> on/off did not exist.
> 
> Internally, the two types of Explorer windows were handled by 
> different frame window classes, and naturally the two different 
> classes got different names. The plain Explorer window frame 
> hosted a view window, an address bar, and a status bar, whereas 
> the fancy Explorer window frame hosted those components plus 
> a folder tree. It wasn't until some time later that the ability 
> to toggle the folder pane on and off was added. To do this, the 
> two window classes were merged into a single implementation that 
> dynamically added in or removed the folder tree.
> 
> Great, we can get rid of Explorer­WClass and just use 
> Cabinet­WClass for everything.
> 
> And then the application compatibility bug reports came in.
> 
> Because even though it wasn't documented, application relied on 
> the implementation detail that plain Explorer windows could be 
> found by doing a Find­Window for Cabinet­WClass, and that fancy 
> Explorer windows could be found by doing a Find­Window for 
> Explorer­WClass. They would do things like launch 
> explorer.exe /e C:\some\folder, wait a few seconds, and then do 
> a Find­Window("Explorer­WClass", ...) and expect to find 
> a window. (Just do a Web search for Cabinet­WClass and 
> Explorer­WClass if you don't believe me.)
> 
> For compatibility, therefore, Explorer windows still use the old 
> class names from Windows 95. If you open the window with the 
> folder pane hidden, the class name is Cabinet­WClass, and if you 
> open it with the folder pane visible, the class name is 
> Explorer­WClass. The two classes are functionally identical, but 
> people who rely on undocumented behavior expect to see the same 
> names from 1995.

http://blogs.msdn.com/b/oldnewthing/archive/2015/06/19/10622575.aspx