Is there any way to do relative linking with the file utilities in IFileManager?

According to the documentation, the Find Files function accepts an ABSOLUTE link to the files being referenced. But this is impossible to package since the installation directory may be different on different computers / platforms and also makes testing on multiple computers really tedious since it basically requires bespoke input for the computer it is being run on.

I just want to be able to pull a link to a file in a directory relative to the content folder. how can i do that?