Hi everyone, I have opened an excel file directly by pegasus and worked lot on it and then press save but the content did not saved , did anybody knows where it saved or any other cache files which contains the content that i have added, Thank in Advance.

Have you tried to check in Excel and in Windows or other operation system in the list of recently used files?

And in Windows you should find the temp file under.
Username is your name and for info the Appdata folder is hidden by standard.
C:\Users\Username\AppData\Local\Temp

The file will have a name starting with WPM$ and sould be in the systems default Temp location with by default is as PM-1 stated. That said, a modified Temporary files directory location in PMAIL.INI will override the system default Temp location.