Sent to a WIMMessageCallback function to indicate that volume information is gathered during an image capture.
WIM_MSG_SCANNING wParam = (DWORD) dwDirectoryCount; lParam = (DWORD) dwFileCount;
[in] Specifies the number of directories that were scanned.
[in] Specifies the number of files that were scanned.
Your routine must return WIM_MSG_SUCCESS.
This message is provided for feedback during long volume captures.