>I have tried that with no success. Same error. I searched all files in my project for "c:\vf\wizards\appwiz.vcx" (the old VFP5 setting) and it only showed up in one file: ..\libs\reports.vct ("Reports" is the name of my project) I can't seem to find a way to modify that vct file.

A vct file is only the memo file for a vcx. To modify the vcx, just use it as a table

USE ..\Libs\reports\vcx

browse the table and find the record that has the old location in the classloc field, and change it there.