In computer operating systems, a file name extension is an optional addition to the file name in a suffix of the form “xxx” where “xxx” represents a limited number of alphanumeric characters depending on the operating system.

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Testimonial
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I just wanted to take a moment to thank you and your staff for doing everything necessary and possible to get us up and running at our new location. I know it has not been without trials and headaches, but everyone has been wonderful working through it. Please let them know how much we appreciate all the effort.
Jacquelynn Sutphin, Lincoln Construction Corporation