I have a program that checks a lot of local files. When the program runs I want it to use the local files as normal, but during the loading of the program I'd like it to check for details of files from another locations (I've edited the files to which has made them longer, I'd like it to do the checks on the original but the execution of the modified files.
Is there any way to spoof a program into thinking it's accessing the file system, but actually point it to another location?