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When I drag files from a .ZIP file my friend sent me, I get this:

Do you want to copy this folder without encryption?`

A problem is preventing that folder from being encrypted.

enter image description here

Can someone explain that error?

When I use 7Zip or WinRar to unzip that same folder, there's no warnings/errors whatsoever.

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2 Answers

up vote 3 down vote accepted

The inital files probably had their NTFS encryption set. I wouldn't worry too much about it. Unless it doesn't open. Then you need to tell your friend to send the files to you unencrypted :)

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what do you mean by NTFS encryption set ? –  Pacerier Jul 23 '11 at 5:51
    
It's essentially an attribute flag, like system and read only. technet.microsoft.com/en-us/library/bb457065.aspx –  surfasb Jul 23 '11 at 18:55
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For what it's worth (and the OP's screenshot helps confirm), this seems to pop up when a file is compressed on a Mac using its context menu/built-in Compress function and then unzipped on Windows. (Sorry, not enough cred to comment, but figured worth mentioning.)

Seems harmless in my experience to say Yes for all. Note that (again, in my experience) the files weren't encrypted on the Mac either.

enter image description here

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