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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up vote 1 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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