Your question is very ambiguous, can you please explain what the
problem is and what kind of answer you are looking for.
Also helps if you can tell us what you tried, and what you know or
don't know so that we can make some further assumptions on how
to answer your question, without others having to ask all of the questions
after you posted.
When you first created a new workbook, did you give the workbook
a name -- File, Save As
If you did, and you don't remember the pathname, you can search
your harddrive for name of the file. (windows Start, Search, Find files or folders)
Not something you really want to rely on because the maximum number
of files you can see in the last used files is 9.
File, and look at the bottom for the files last updated/used.
In order to see up to 9 files, I think you have to update your options,
will assume Excel is new to you and that you have at least Excel 2000.
Tools, Options, General, [x] Recently used files list: 9 Entries
Tools, Customize, Options (tab),
make sure that 'Menus use Recently used commands first' is not chosen.