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File I/O operations pass data to and from files. Use the File I/O VIs and functions on the File I/O palette to handle all aspects of file I/O, including the following:

• Opening and closing data files.
• Reading data from and writing data to files.
• Reading from and writing to spreadsheet-formatted files.
• Moving and renaming files and directories.
• Changing file characteristics.
• Creating, modifying, and reading a configuration file.

You can open, read or write, and close a file using a single VI or function. You also can use a function to control each step in the process. Use the Read From Measurement File Express VI and the Write To Measurement File Express VI to read data from and write data to .lvm, .tdm, or .tdms files.