i used to name a program by clicking new and then by naming a program i click "save as" in both C,C++ and then i open a that named file for writing a program into it and at last i click save and whenever i need to run that program i open that program, but how i can start with perl?

Now, breath slowly. What were you clicking on? Visual Studio I guess. You can use Visual Studio for perl, but it is an over-complication, you just need an ordinary text editor to create your program files, even Notepad would do if you are desperate. There is no compile/link phase that you have to invoke manually. Save the file with a '.pl' extension, then run it from the command-line. Now try your examples with open.

A Perl file handle is (simply put) an abstraction of the FILE struct used by stdio, but it will not help you to think too much in C terms. Try to think in Perl terms instead, and read the tutorials.