perl and cygwin perl (unix style paths)

Hi gurus:

I am trying to run perl command via cygwin. I have cygwin mapped drive in
which i use the locally installed perl(and not cygwin perl) but apprently,
that perl is not able to find an existing file. When the same command is run
via cygwin perl, it runs fine.

Does perl on windows understand unix style path? Cygwin perl understands
unix style path. Is that the issue? what else could be the issue?

/cygdrive/c/Perl/bin/perl /temp/Nightly/bit/mailer.pl

Can't open perl script "/temp/Nightly/bit/mailer.pl": No such file or
directory

But the file exists at /cygdrive/c/cygwin/bin/perl
/temp/Nightly/bit/mailer.pl