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 by default; that is USE_LARGE_FILE_API is set to 1 (ON, true, yes). Some UNIX systems do not support files greater than 2 gigabytes in size, and so for those systems, set this variable to 0 (OFF, false, no), which causes the runtime to use the standard 32-bit file system API. This variable has no effect on Windows platforms or systems where 64-bit file offsets are not supported.