What is a file that begins with ._ ?

A client just sent me some files that begin with ._ in the extension.
(Client claimed they are vector files for a video project)
I tried to download and Mac told me they are system files and will be hidden.
sure enough they didn't show up my desktop. I download again adding a " to the front of the extension. I got the file on my desktop- but it would not open.
I trashed it.
I then did a spotlight system search for the ._ files I think I download and I got no result.
I'm now worried.
Are these ._ somewhere on my system?
Can they do harm to the system?

In Unix the initial period in a filename causes the file to become invisible. Spotlight's default configuration will not locate invisible files. If the files are downloaded to your Downloads folder or to your Desktop then you can make them visible in a number of different ways.
1. Enable Finder to Show Invisible Files and Folders
Open the Terminal application in your Utilities folder. At the prompt enter or paste the following command line then press RETURN.
defaults write com.apple.finder AppleShowAllFiles TRUE
To turn off the display of invisible files and folders enter or paste the following command line and press RETURN.
defaults write com.apple.finder AppleShowAllFiles FALSE
Alternatively you can use one of the numerous third-party utilities such as TinkerTool or ShowHideInvisibleFiles - VersionTracker or MacUpdate.
2. Open the Terminal application in your Utilities folder. At the prompt enter the following commands pressing RETURN after each. I will assume for the purpose of illustration that you have downloaded the files to your Desktop.
cd /Users/yourusername/Desktop
mv ._filename.ext filename.ext
This will rename each file to the same filename but without the initial "._". Repeat the "mv" command for each file substituting the actual filename.ext for the "filename.ext" in the command line. If you have downloaded the files to a different location, then substitute the full path to that location in the "cd" command line.
3. Download a utility such as Batch Rename'Em from CNet Downloads or MacUpdate and use it to mass rename the files by removing the initial "._".
4. Have your client rename the files before sending them to you by explaining that they are invisible on the Mac with the initial period in the filename.
5. Configure Spotlight to search in system folders and to display invisible files in search results.
6. Download Easy Find - CNet Downloads or MacUpdate - and use it instead of Spotlight.
Message was edited by: Kappy

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