from testing that, although documented nowhere, having ADDLOCAL on
  the install line overrides INSTALLLEVEL.
- Track all files extracted from cabinents as tempfiles so they can be
  removed at the end of the install to not leave uninstalled but
  uncabbed files laying around.

- Set the INSTALLLEVEL in CostFinalize if it is not set.

and IInternetProtocol declarations.

which they are evaluated.

UpdateICMRegKey{A,W}.
Forward UpdateICMRegKey to UpdateICMRegKeyA.

the AVI splitter.
Fixed some returned error codes.
Show refcount in the AddRef/Release traces in filter.
Added 24 bits source in the video renderer.

thread apartment scoped.

Forward AVIBuildFilter, AVIFileCreateStream, AVIFileOpen, AVISave,
EditStreamSetInfo, EditStreamSetName to their respective *A variants.

GetDeviceState should be 0x80 (only the high bit set), not 0xff.

redundant.

handled bytes when no overlapped operation is done.

per-thread buffers.