The .old file extension is a good clue the program is not running because .old is not an executable extension (like .exe is).
A trick I learned many years ago when wondering if safe to delete an unfamiliar file or folder (if Bing Google does not tell me what it is for) is to simply rename the file or folder by appending the name with the date and the word "delete", then see if something breaks (get a file not found error).
To illustrate:
Old folder name: de34juidfj277eu
New folder name: de34juidfj277eu-5-23-20-delete
Old file name: readmesqlexp2005.htm
New file name: readmesqlexp2005.htm-5-23-20-delete[/indent]
Then, I just go about my business for the next few days and see if everything is still working. What typically happens for me is I forget about it until weeks or even months later when I stumble on the file or folder again. By appending the folder or file name with the date and the word "delete" I can see how long it has been since I renamed it, and "delete" reminds me of my intentions. If all has been working since that date, I know it is safe to delete.
If something breaks, since I only "appended" text to the name instead of totally renaming it, I don't have to remember the original name - I can easily see what it was, and simply cut off my appendage
ummm, I mean rename it back and be good to go.
