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The Read-Only attribute will help prevent software programs from saving changes to a file. This is useful if you want to write protect a file. Note that a Read-Only file may not prevent it from being deleted depending on the method used. Under the old MS-DOS you could set a few files with the Read-only attributes and delete all the files using a "DEL *" (Delete all) command and the read only files would not be deleted. By design, the read-only bit must be cleared before you can write to a file. A file marked with the hidden attribute will be hidden from view under normal viewing conditions. This is a convenient way to hide the file from standard user-mode software. However, some software will ignore the Hidden attribute bit so be aware the file with the Hidden attribute bit is not always invisible.The hidden and system attributes are typically used together for operating system related files. The system bit denotes a file or directory used exclusively by the operating system which should not be altered or deleted directly by the end user.