Redirecting form variables

I am using an imcoming link URL with a query string with variables in it using GET.
I moved the location of the original script to a new location.
Links are coming in with the GET variables from other sites so I can't just change the target URL. I need it to be backward compatible. As it is right now I wrote a small Perl redirect script using the old file name and location but I really would like to use .htaccess if possible.
Using .htaccess I tried redirecting the old directory to the new directory and tried redirecting the old target file to the new target file but the embedded variables aren't redirected.
I am just sent to the new file with no query string. Each incoming link has the same varables embedded in it but with different values. Besides using a redirect script how else could I do this? Any ideas? Thanks for the help and your time!