$ dir /b nofile.plx
File Not Found

$ perl nofile.plx
Can't open perl script "nofile.plx": No such file or directory

$ echo die 6; > nofile.plx

$ dir /b nofile.plx
nofile.plx

$ perl nofile.plx
6 at nofile.plx line 1.

$ del nofile.plx

$ dir /b nofile.plx
File Not Found

$ perl nofile.plx
Can't open perl script "nofile.plx": No such file or directory