I just realised what DLLZIP is. You can download it here. http://www.mnwright.freeserve.co.uk/graphix.htm

Ah OK. I should have tried the link. Must be slipping in my old age. If Martin says you don't need it, then you don't need it. Hope you got whatever it is sorted out.

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Hmmm. If Martin doesn't know there's no point in me suggesting anything. Sorry.

PS. Did you try ImageTool? If you don't have it I think it's included in one of the FS2004 SDKs but I don't know which one. It came bundled with FS2002 Pro.

PPS. Silly me. Try this. http://ddsdx.uthscsa.edu/dig/itdesc.html

ImageTool works in much the same way as DXTBmp. You should be able to use it for your Alpha Channels. There's no Help to speak of so you will have to figure that out yourself. I'm not sure the one from my link is the same version as the one bundled with FS. If you don't have FS2002 you can get the correct version from the FS2004 SDK download page. It should be included in one of those SDKs but I don't know which one. There should be a list of included files in the file description for each SDK.

PS. ImageTool is included in the FS2004 gmax Gamepack SDK & Terrain SDK. http://www.microsoft.com/games/flightsimulator/fs2004_downloads_sdk.asp It's only a small file & I can mail you mine if you wish.