if I have a folder with 2 .avi files, that are part of the same movie, how do I get the Movie Library to show/play these correctly?

You have to merge them with a program like VirtualDub.

Going to assume you have ac3 audio for both avis, that actually makes it easy.

Open VirtualDub

In the Menu Bar Select Video -> Direct Stream Copy
In the Menu Bar Select Audio -> Direct Stream Copy
File->Open Video File (select part 1)
File->Append AVI segment (select part 2)
File->Save As AVI

That should do it (hopefully).  You might want to move the split avis to a safe place outside the movie library if you need them again (like if something doesn't work).

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XPS 420: Intel Q6600 CPU, nVidia 9600 GT, 3GB DDR2 RAM 800MHz, 320GB HDD, 500GB HDD, 16X DVD-RW, 3 x ATi CableCard

Panasonic 50PZ800U HDTV, Onkyo TX-SR705 Reciever, 4 x Mission m73 Speakers, Mission m71c1 Center Channel, B&W ASW 650 Sub

Thanks, I guess that would be the last resort!

But I would almost rather just make 2 folder for them, if there is no way to get mediacenter to recognise that they are part of the same movie ....? (anyone)

I guess this is one for the wishlist :)

Having the same issue and tried everything that I can think of.  I think the only option (so far) is to merge the files as suggested previously.

Try using Combine in Video ReDo

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Intel Quad core Q8300 2.5Ghz/2.5Ghz, 4Gb RAM, Nvidia 9800GT Graphics, 750Gb HDD, 1Tb HDD, Vista Home Premium, DMA2100 (x2). 42" Panasonic Plasma, 32" Toshiba LCD, Yamaha RX-V496RDS.