Always copy the file on your harddisk first before you open it
Never open it in the mail.
Maybe they send a link to the file to you instead of the file ?
You can try this
Tools>Options>General uncheck "Ignore other Applications"
Exit Excel and try again
If this doesn't work try to re-register Excel
Close Excel first and
On the Windows Taskbar
1 ) Start>Run "excel.exe /unregserver"(no quotes)>OK.
2) Start>Run "excel.exe /regserver"(no quotes)>OK.
See the space between exe and /regserver
You might have to designate a full path to excel.exe.
In that case Start>Run "C:\yourpath\excel.exe /regserver"(no quotes)>OK.
You probably do not have Excel on your computer. So, you would need an excel
version capable of using that file or the excel viewer which will let you
look but not manipulate.
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