A family of Microsoft word processing software products for creating web, email, and print documents.
As Doug said, a dump file is a record of everything that was in the computer's memory when a crash occurred, and it's meant to help diagnose what went wrong. Each file represents a different crash.
If you are not planning to use the dump files to investigate the cause of the crashes, then they are useless and can be deleted. I would not even bother to back them up.
Interpreting a dump file is a task for a technician with adequate tools (usually Microsoft Visual Studio and a set of "symbol files" that can identify the memory addresses listed in the dump file). It isn't something that just anyone can do. If you want to hire someone to examine one or a few of the files and try to fix the computer, save only the latest one(s) on a writeable DVD.