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How do I encrypt a folder, preferably with AES, using a Mac OS 10.7, so that I can also use it on Windows? I have tried ISO files, which it seems I can't mount on Windows XP.

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You can use TrueCrypt to encrypt the file and place it in a volume in Mac OS X.

Then, using TrueCrypt in Windows, you can mount the volume (after entering the passphrase of course) and access the file.

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