hwnd: 0x001d051c and 1901852 - is that possible to convert them?

Hello,

Getting window handle of an application, AccExplorer shows window handle in the form of 0x001d051c while windows APIs expect it to be long (e.g: 1901852); so how to use the value 0x001d051c on APIs? Is there a way to convert it into the long format?

I know how to get a hwnd as a long value- from a certain window/application; I just don't know why some spy tools use the above format (e.g 0x001d051c) and how to convert it (if possible) into a long value in order to use it in the below api:

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long

Could somebody please help me...
Thanks.