[Description] Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, FileIOPermissionAccess.Read is required. If file access is FileAccess.ReadWrite and the file exists, FileIOPermissionAccess.Write is required. If file access is FileAccess.ReadWrite and the file does not exist, FileIOPermissionAccess.Append is required in addition to Read and Write. [Member name] 
OpenOrCreate Supported by the .NET Compact Framework.