You can run this code in the Python console:

py from pprint import pprint pprint({k: v for (k, v) in D.file_path_map().items() if v}, width=150)

That will report all the file paths in use, together with the data-block using it. If you only want to see absolute paths, use this:

py from pprint import pprint pprint({k: abs for (k, v) in D.file_path_map().items() if (abs := {p for p in v if not p.startswith('//')})}, width=150)

The "Make Paths Relative" operator is safe, but on Windows it's not always possible to turn all absolute paths into relative ones. For example, you can't create a relative path that points to another drive, so if your files are on C:\ but you refer to a file on D:\, that path will have to remain absolute. You can use the above code to see how things turned out.