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Don't worry about Win 2000, I'm more interested to know if the original files work on Win 98.
Are you using a disabled bitmap? If so, can you try it as a static bitmap as there is some issues with bitmap drawing on Win 98 and that might be the problem here.
Or could you post a link to the bitmaps you use and I will test this as I 've remembered where a Win 98 machine is that I can access.