How can I rename html Firefox saved webpages without "unlinking" the saved files that come with it?

Using Mozilla Firefox you can save webpages in a "complete manner", an html file is created along with a file containing all the images the webpage uses, it has a title of "NameOfWebpage_files". When I renamed an html I tried renaming the folder as well but now the webpage has absolutely no images to open with. I cannot go back to the webpage I tried to save cause it is now inexistent, and I do not remember the original name of the webpage I saved. Stupid yes, but beyond the point. Is there a way to rename html saved webpages and have the images remain linked to it?