Cannot open excel inside word document
 

I'm using a Word document with incerted Excel spreadsheet. I normaly copying
data line by line from the original excel document into incerted excel file.
Always at one point, when I try to double-click to re-open the incerted excel
file, a message appears saying the the "file is corrupted and no longer
available". Most of the files I work with are on a server, but similar thing
happens with files stored on my local drive.

Thanks.

SF