People *usually* want a list of extensions so they can automatically > categorize the format of files on disk or to filter to only show > extensions they think GDAL supports. I find this practice abhorrent! > GDAL is based on the idea that file formats are discovered by > inspecting file contents rather than based on extension and I don't > want to make it too easy for applications to ignore this principle and > revert to extensions. > > In this case, its about filtering files in a GUI.
I agree that its probably a good idea to keep GDAL_DMD_EXTENSION as it is (preferred extension), and add GDAL_DMD_EXTENSION_LIST as alternative filtering options. And, of course documenting the intention of these, and the behaviour in GDAL's file probing. - Oyvind
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