[Description] Opens the file if it exists and seeks to the end of the file, or creates a new file. Append can only be used in conjunction with Write. Attempting to seek to a position before the end of the file will throw an IOException and any attempt to read fails and throws an NotSupportedException. [Member name] 
Append
C r e a t e N e w
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O p e n O r C r e a t e
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A p p e n d