What does a period and underscore mean before a filename?

Dear Experts,

What does a dot and underscore mean before a filename. All the files are very small (less than 1kb)

Here are a few examples...

._Guidance Notes A4.pdf
._Marketing_Executive1.doc

I found the files on a memory stick.

Nick
LVL 1
nkewneyAsked:
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Brian PiercePhotographerCommented:
looks like someone just used those names so these files appear at the top of the file list and are easy to find.
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war1Commented:
nkewney,

In some programs, files like _Marketing_Executive1.doc are temporary files created by the program.  I have seen these types of files in Frontpage.

Open the file with the PDF or DOC program and determine if you need to keep them or not.
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nkewneyAuthor Commented:
Thanks
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