Every once in a while our memories don't serve us well, and we forget the name or path of a file or lose track of a file altogether. If you know you created it, and you know you saved it, but you can't remember what you called it, try this:
Open Windows Explorer.
Go to Tools and select Find.
Select Files or Folders.
Click the Date Tab.
Select Find all files, then choose Modified from the drop-down list.
Click between and then choose a date range when you know you worked on the file.
Click Find Now.