On the fly File installation

Question put simply: Is there a way to enable/fake a file command useing a variable.
"File "FileToInstall.slg" to File $R1

Im designing a script that will enable a non-computer oriented person to modify the files that will be installed to a dir. Because of the other needs of the installer, Im unable to use one of the simpler install builders where files are simply specified.

Files are placed into the installer on compile time and thus their paths must be hard coded. You cannot use a variable as they are for run time use.

Stu