How do I open. bar files?

I'm new to Blackberry and this may sound stupid. but can someone please tell me how to open. bar files cause after I download the files and try to open it I get "Unable to open the file".. please help and thanks

you have to use sachesi to install bar files

Install Sachesi for side-loading:

1. Download the appropriate version here: Sachesi
2. Un-archive the exe file (currently a 7zip file)
3. Put the exe file in a folder on it's own on your computer (it's a stand-alone program)
4. Plug your device into your PC.
5. Double click the Sachesi exe file to launch it. Enter your device password, if you use one.
6. Click on the install tab.
7. Drag/drop the bar file into the window. You'll see a progress bar on your device and in Sachesi.
8. When complete, unplug your device. You're done.

*** Note that BlackBerry Link must already installed on the computer (this installs drivers you'll need).
*** "Development Mode" is not required when using Sachesi.
*** Unless you know what you're doing, do not mess with the other, advanced options within Sachesi!