This is Perl module PerlIO::fse.
INSTALLATION
PerlIO::fse installation is straightforward. If your CPAN shell is set up,
you should just be able to do
$ cpan PerlIO::fse
Download it, unpack it, then build it as per the usual:
$ perl Makefile.PL
$ make && make test
Then install it:
$ make install
DOCUMENTATION
PerlIO::fse documentation is available as in POD. So you can do:
$ perldoc PerlIO::fse
to read the documentation online with your favorite pager.
Goro Fuji (gfx)