What is the real difference between a .xls vs .xlsx file ?
Hi ... Can somebody point me to a credible source of information explaining what are the real differences between a .xls and
.xlsx file ? I have many .xls file. I began using Office v14 recently and wonder if it is useful to change them all to
.xlsx instead of still saving them to .xls format.
What will I be loosing or missing ?
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If none of the benefits are things you're interested in, there's no reason to change.
In general, .xlsx/.xlsm files are somewhat less likely to become corrupt, and can be smaller, but if you make regular backups and have plenty of disk space, there's no reason to spend the time converting.
OTOH, there's usually no reason not to take advantage of the OOXML formats for new files that you create.
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