Where are extended properties for .avi files stored by DO? I have written a script using "SetAttr META "tags:<...>"" to tag a few thousand files of various types. For most file types, the tags are stored in Alternate Data Streams, which I can view with AlternateStreamView and search with Everything. For .avi files, however, I can see the tags in DO but I don't see an ADS, and I can't find a way to search them with Everything.
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By default Opus will store metadata in the file itself if it can. You can disable this and make it always use ADS by turning off the Preferences / File Operations / Metadata / Save descriptions to internal file metadata if possible option.
Hmmm... interesting, but not quite the effect I was hoping for. When I toggle off this setting and re-tag the file, I get an ADS whose name is a GUID ({4c8cc155-6c1e-11d1-8e41-00c04fb9386d}) instead of the usual "DOpusMetaInformation". Still can't search the tags from Everything, unless I'm missing a setting somewhere.
Sorry, what I told you wasn't completely correct. The option I referred to only affects file descriptions (i.e. those set with the Description command). It doesn't have any effect on how tags are stored. I'm not sure where that GUID is coming from but it's not anything to do with Opus.
Opus understands the .AVI file format so will store tags directly in the file (in an IKEY chunk). Everything would need to understand that file format to be able to index them.