Vbox 5.2.16 Problem with Host's Alternate Data Streams

[AsusUser]

In windows xp sp3 host running an earlier version 4 vbox, using windows xp sp3 guest, I was able to access a file's alternate data stream in the host exposed through shared folder. e.g. in the windows guest command prompt:

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echo hello > e:\test.txt:add

where e: in the guest was set up in vbox as a writable shared folder referencing a host's folder

But after upgrading to vbox 5.2.16, the same command returns:

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 The parameter is incorrect.

I also tested vbox 5.2.16 with the following combinations, they all yields error:

windows xp host/ windows 7 guest
windows 10 host/ windows xp guest
windows 10 host/ windows 10 guest

Is it a bug with vbox 5.2.16?

[mpack]

Since a shared folder is just a network API (like ftp or http), not a disk drive, there is no possibility of accessing "alternate data streams" unless the network API understands such a feature, which AFAIK it does not.

[AsusUser]

I am sure it was working in some previous versions of vbox since I have been using it for quite some time. But whether it is an intentional feature or not is another question.

[mpack]

Such a feature could only be intentional, but as I said I am quite sure no such feature has ever existed. The GA shared folder API is really very simple.

Of course a true Windows network share may support more advanced filesystem features, perhaps that is what you remember.

Just to be clear: alternate data streams is a feature of NTFS. A GA shared folder is not NTFS, it's a shared folder.