I deleted files coldnt open like .jpg,pdf.part

file name unknown and couldn't open or (didnt realize they may have been important )so like a fool i deleted them .jpg,pdf.part,png,gif,ps exe and so forth now i am afraid these were part of the computers programming.. i am new and am so worried, thought i was cleaning junk what do i do now? trash emptied will i ever know what i deleted?

Hi,
Some Info.
First click anywhere on the Desktop that might be visible around anything you have open.
The word Finder should now appear in the menu bar.
Click and hold this to see the menu and select Preferences.
In the Preferences Window that shows up select Advanced.
Select (Tick the check box) the option to Show All File Extensions.
When this is done all the files on the computer will display their relevant .something ending (Extensions).
So most things in the Application folder will now show ApplicationName.app
In the Pictures Folder you will see different ones (if that is where your Picture files are)
.jpg .tif, .png .gif
Some of these such as .jpg or .gif and .tif are fairly universal meaning many apps can open them
.pdf files can be opened by Preview and Adobe Reader as they are Portable Document Files (PDF) and needs a PDF reader. (they can be a mixture of Picture and Text like a word processing cocument)
You will notice in my Pic I have ones ending in .psd
These are saved from the Photoshop Graphics app.
This leads on to the next point.
Most apps will save Files with an ending that in most cases only they can open.
For instance iChat can be set to Save Transcripts.
these are stored in your Home Folder/Documents/iChats in dated sub folders.
You will find they end in .ichat
TextEdit can save in two formats (file Extensions)
.rtf (Rich Text File) or .txt (Plain Text FIle)
Ususally in a file name there is only one . (dot) before the end.
So the way you wrote .jpg.pdf etc. would not exist (there are of course exceptions)
Double Clicking a file will normally get the App that created it or the nearest thing you have that can open it to Launch and then show you the file. (There are ways to Control which app opens which files but that is another lesson)
If this does not work you can go to the Finder's File Menu and use Open With - which will present you with a list of apps that can open a file. (Often this will include Browsers as they often have Plug-ins that deal with the Pics on web sites - Safari for instance includes a PDF reader)
.js does stand for Javacsript.
This is used on Web sites to help with functionality.
It would be unusual to download this unless you were downloading something for a web site about building web sites.
On most web sites the Javascript is a separate file that the page accesses when needed to do a specific thing. Sometimes though small short exerts of javascript may actually appear on the page (When looked at in Source view).
It is similar with .css (Cascading Style Sheets) that many web sites use to change basic HTML into the layout and colours you want. (Again it would be unusual to download such a file)
If you want to know what created or might open a file search here (Common File Extensions)
I would be cautious about deleting anything that you don't know what it is.
The exception to that would be anything that is in your Downloads Folder or has been placed on the Desktop.
Anything that is in Your Home Folder (the Little House icon) is yours.
However deleting stuff in the Library that is inside there may cause problems with apps running properly.
In may cases the Preferences you set are stored there. In some cases the results of you choices cause other things to be stored that are needed when the app runs.
Deleting things in Documents, Pictures, Movies only deletes things you might want to Keep.
I would also leave iTunes and iPhoto files alone in their relevant places.
If in doubt post and ask. Be clear about where the file is located and what you know about how it got there.
10:50 PM Saturday; May 21, 2011
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.7)
 Mac OS X (10.6.7),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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