A user in my organization has renamed one of her Excel files. Subsequently,
the first worksheet in her file appears to be renamed to the new file name
and none of her other worksheets are listed at the bottom of the application
window. Pressing Ctrl+PgUp and Ctrl+PgDn do not shift between worksheets as
Excel thinks there is only one.

Are there any possible ways of recovering these lost worksheets without
resorting to an Excel recovery tool such as R-Excel Recovery or XLS
Regenerator?