It seems that 7z 18.03 can extract alternate data streams from rar5 archives but not rar4. Is it correct? Is it expected?
Yes, rar5 streams are simpler for supporting than rar4 streams. There is such comment in 7-zip's rar4 code:
// It was commented, since it's difficult to support alt Streams for solid archives.
As I suppose there were some problems for that code. So it was not implemented in 7-zip.
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It seems that 7z 18.03 can extract alternate data streams from rar5 archives but not rar4.
Is it correct? Is it expected?
Yes, rar5 streams are simpler for supporting than rar4 streams.
There is such comment in 7-zip's rar4 code:
As I suppose there were some problems for that code. So it was not implemented in 7-zip.