Try to be more clear - do you actually want to rename an existing file from "file1" to "file1.rtf"? If you do, than perl's 'rename' function should work.

Do 
   perldoc -f rename

[download]
at a command prompt to read the perldocs on how to use 'rename' - it's pretty much what you would expect.

Also, you are not using the substitution operator properly - do 
   perldoc perlop

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at a command prompt and search (using the forward slash "/") for 'subst' - you'll see all the info you need.

HTH.

In reply to Re: How do you add .RTF to a file by hmerrill
in thread How do you add .RTF to a file by skyler

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