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
POSIX Subroutine: Opens an external unit.
CALL PXFFDOPEN (ifildes,iunit,access,ierror)
The PXFFDOPEN subroutine connects an external unit identified by iunit to a file descriptor ifildes. If unit is already connected to a file, the file should be closed before using PXFFDOPEN.
On Windows* systems, the default value of the POSIX/IO flag is 0, which causes PXFFDOPEN to return an error.
To prevent this, call subroutine PXFPOSIXIO and set the value of the POSIX/IO flag to 1.