bit unsure if Im misunderstanding your question in some ways.
the answer to this depends on storage mechanism and what type of files. Are they flat .xml files or unflatted composite files? Are you using version control or not?
If you are not using version controlled software (Git etc.) and your files are just flat .xml files, then you can check the project properties to determine exactly what directory the files are stored in - or easiest still - just highlight the project root, right click to launch the context menu and select 'Save As' - this will open a windows dialogue to the location of where the project is currently saved.
Does that help? Or have i missed something?
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta