Have run the "Detect & repair" under Help menu in Excel. Problem solved.

"Somboon" wrote:

Hi,
I have a problem with Excel. The file name changed by having number "1"
added to original file name every time I open an Excel file. If I re-open the
same file again without closing the file that has number "1", the file name
changed by having number "2" added. Anyone know how to fix this please?
Somboon