Hi johngphillips, Please tell me how you did it. I am having the same problem. Downloaded some SRTM data (in .hgt format) and ArcMAP 10 doesn't want to open it (even though Carrie says it should be able to open in ArcMAP 10). I only get the message "Invalid raster dataset. Failed to create raster layer". After renaming it to .bil and creating the header file, I am no better off. Please tell me what you did. Regards, Jan
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