>The directories are
>

>    APP
>     |
>     +--USER
>          |
>          +--DATA
>

>Were the Runtime in the APP and this is the "START IN" directory.
>The compiled EXE is in APP\USER this "TARGET" directory and the data files are in the APP\USER\DATA directory.
>
>This has been working this way for years. Would simply moving the runtime to the same directory as the EXE correct the problem? The user system is 500 miles away and its difficult to "try" just to see if it works.

This should work for you. The ESL can be in the START IN directory or the TARGET directory. Very puzzling on why the the EXE cannot find the support library. I would try:

(1) Copying the ESL to the APP\USER directory.
(2) Make sure START IN directory is correct. Perhaps a long directory name became mangled and XP cannot read it.