インテル® Fortran コンパイラー 14.0 ユーザー・リファレンス・ガイド
Portability Function: Makes the specified directory the current, default directory.
The result type is LOGICAL(4). It is .TRUE. if successful; otherwise, .FALSE..
If you do not specify a drive in the dir string, the named directory on the current drive becomes the current directory. If you specify a drive in dir, the named directory on the specified drive becomes the current directory.