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Last year I created a ppt file and encrypted it. After when I bought a new SSD disk for my laptop, I reinstalled my window. Now when I try to open the old encrypted ppt file which was created by the old administration's user, the PowerPoint said that it cannot read the file. And since the last time I encrypted this ppt file, now with my new administration's user, I don't have any permission to change the file's properties or unencrypt it, I even cannot just copy it to another space.What should I do?p/s: I encrypted it by right-mouse clicking on the ppt file-> Properties-> Advanced Attrib
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