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Native file creation disposition.
public enum NativeFileMode
Create = 2
Creates a new file, always. If a file exists, the function overwrites the file, clears the existing attributes, combines the specified file attributes, and flags with FILE_ATTRIBUTE_ARCHIVE, but does not set the security descriptor that the SECURITY_ATTRIBUTES structure specifies.
CreateNew = 1
Creates a new file. The function fails if a specified file exists.
Open = 3
Opens a file. The function fails if the file does not exist.
OpenOrCreate = 4
Opens a file, always. If a file does not exist, the function creates a file as if dwCreationDisposition is CREATE_NEW.
Truncate = 5
Opens a file and truncates it so that its size is 0 (zero) bytes. The function fails if the file does not exist. The calling process must open the file with the GENERIC_WRITE access right.