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Are you sure we mean the same thing?

You seem to talk about a specific command line argument of the compact command with a Windows typical (and IMO ugly) option style with '/' instead of '--' as option marker and ':' instead of '=' as option value separator.

But that would not be directly related to ADS and I cannot imagine a good use case where the compact command should use ADS.

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Yes, look up WofCompressedData. It's the stream name ultimately used by that command.

Thanks, with this keyword I found https://devblogs.microsoft.com/oldnewthing/20190618-00/?p=10...

In context of ADS the first thing I imagined was storing the compressed and uncompressed file alongside. (which is rather silly, why compress at all)

This use case is also kinda strange. Have the compressed content as ADS, the primary contend filled with 0 as sparse and fill it when needed/accessed. :/

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