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In systems supporting file encryption, control over whether or not to encrypt a file is available on a file-by-file basis.
If file encryption has been enabled by a call to SetEncryption(), an individual file can disable encryption by OR-ing ctNOENCRYP into the x8mode member of the XCREblk structure.
Whether or not SetEncryption() has been called, setting the filkey member of the XCREblk structure to a non-zero value causes the file to be encrypted using the value of the filkey member as the encryption key.
