Hi and welcome to Advanced Installer forums,
From your post I can think of a couple documented possibilities that may help you:
1. If you want to perform a
file operation you should take a look on our
How do I install a user specific file? article.
2. If you want to conditionally install files with identical name in the same folder you should follow our
"Install files with the same name" article steps.
Do you have your files added in your package or they are next to the MSI package?
If the above do not suit your scenario, can you please exemplify and give us more details about the behavior?
All the best,
Daniel