They are organized in folders (that you name).
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Folders have no extension.
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Manila, Philippines. They get their name from the fibres of the banana leaves.
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There is no specific collective noun for folders, in which case a noun suitable for the situation is used, for example a drawer of folders, a pack of folders, a box of folders, etc.
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A data storage device.
There are many types of pocket folders available. There are 2-pocket, tri-pocket, folders with holes and without, colored folders, and folders with pictures on the cover.
Storage devices hold folders and folders hold files.