Video with alpha channel ... comes out opaque

Hi,

   Got an uncompressed avi with ARGB frames, each with an alpha channel.

When I render this with media foundation, the frames are decoded, but the alpha seems to be ignored and the frames come out visible, but opaque.

Please could Microsoft supply a sample application that demonstrates video streams that include alpha channels decoding correctly.

Thank you.

Best regards,
Steve Williams
Advance Software