On UNIX systems, this variable allows you to turn on or off file system API support for very large files (greater than 2 gigabytes). Support for large files is enabled when USE_LARGE_FILE_API is set to 1 (on, true, yes). Some UNIX systems do not support files greater than 2 gigabytes in size. In those situations, setting this variable to the default of 0 (off, false, no) causes the runtime to use the standard 32-bit file system API. This variable has no effect on Windows platforms.