ThinApp - Reading from real OS drive

Hi,

Please excuse me if this is a simple question with a simple answer - i'm attempting to tune an application by putting files onto where I'd execute the ThinApp from. - hoping capture a package that when the ThinApp is executed it is able to read from a file that's pre-seeded onto the real OS disk, example below :

ThinApp capture is like below -
c:\software\ini files\                     <- empty folder

c:\software\bin\sample.exe

Real OS is like below -

c:\software\ini files\sample.ini

^ so that when I execute the ThinApp the sample.exe software discovers and parses the sample.ini from the real OS disk, I've tried Merged mode (package and c:\software\ini files\) with no luck.

Am i doing something silly here or is this not possible?