Discards all changes that have been made to a transacted stream since the last IStream::Commit call. On streams open in direct mode and streams using the COM compound file implementation of IStream::Revert, this method has no effect.
HRESULT Revert(void);
This method discards changes made to a transacted stream since the last commit operation.
Windows NT: Use version 3.1 or later.
Windows: Use Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in objidl.h.
IStream - Compound File Implementation, IStream::Commit