saved excel files

[Dave o]

wehn my boss saves certain excel files, they sometimes save as a file without
the .xls extension. his "save as" says to save it as a excel file, but his
does not then say "(.xls)" like mine does.

what do i need to change or how is this happening?

 

[Jim Rech]

It might be that in Windows Explorer under Tools, Folder Options, View,
"Hide extensions for known file types" is selected.