The .menc extension is the indicator that tells
whether a file is encrypted. The purpose of the extension is to
indicate that you can't open those files. A Lock icon is also
associated with the encrypted files.
When you insert the storage
card back to your device where the files were encrypted, the [GUID]
will match with the decryption key on your device and the [GUID].menc
extension will not be displayed. Encrypted files will appear just like
normal files and they can be opened.
Decrypting files: To
decrypt files that are encrypted, the current solution is to transfer
them from the storage card to a computer via ActiveSync or Windows
Mobile Device Center, and then copy them back to the storage card after
the Storage Card Encryption has been disabled on the device.
- To disable Storage Card Encryption:
- Go to Start>Settings>System Tab>Encryption.
- Uncheck the box that says “Encrypt files placed on the storage card.”
- Tap OK.
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