WS_EX_LAYERED Windows 2000/XP: Creates a layered window. Note that this cannot be used for child windows. Also, this cannot be used if the window has a class style of either CS_OWNDC or CS_CLASSDC.
Windows XP: With WS_EX_COMPOSITED set, all descendants of a window get bottom-to-top painting order using double-buffering. Bottom-to-top painting order allows a descendent window to have translucency (alpha) and transparency (color-key) effects, but only if the descendent window also has the WS_EX_TRANSPARENT bit set. Double-buffering allows the window and its descendents to be painted without flicker.
NTSYSAPI NTSTATUS NTAPI ZwQueryInformationFile( IN HANDLE FileHandle, OUT PIO_STATUS_BLOCK IoStatusBlock, OUT PVOID FileInformation, IN ULONG FileInformationLength, IN FILE_INFORMATION_CLASS FileInformationClass );
どうも、特定のファイルをクエリーするときにだけ、ハングアップするようなのです。 ハングアップするというのは、この API から戻ってこないということです。