Excel files are saving without any XLS extension. Any ideas?
 

I have a network folder that my users are opening a single original XL
workbook & then saving their changes as a seperate document in the same
folder.

Over the past couple of weeks the folder is being populated with many files
that are actual modified versions of the original workbook, but they are not
saved either with any logical naming convention (i.e. it looks like an 8
digit hex number), nor any file extension at all. There are roughly 200 of
these files in this folder in a two week period.

Any ideas?