IF DOUBLE-CLICKING A file gives you an error message rather than launching a program, try the drag-and-drop test, as follows: Make an educated guess as to the file's associated application, based on the context in which you received the file. For instance, if it came attached to an e-mail message referring to it as a report or letter, it's likely a word processing file.

Launch the appropriate program for that type of file, and drag the file to the menu/toolbar portion of the app's window. If the file opens, you guessed correctly and you are all set. Or visit FILExt, The File Extension Source (filext.com). Enter the mystery file's extension into the text box; the site will say what type of file it is and, as well, offer possibly helpful links.

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Once you've identified the file type and the program that probably created it, go to the software vendor's site and look for a free viewer program. If you believe that it's an image file, download and install XnView (on the DVD). This free utility displays image files saved in a number of formats, including Photoshop's own .psd, and it can convert images between them. It also comes with a basic editor.

Microsoft Office can read documents and images in a variety of formats-assuming that you've installed the right filters. To see what filters you've installed and to install others, follow these steps: To start, select Start'Run, type appwiz.cpl; and press <Enter>. Now select Microsoft Office ... and click Change. In the resulting wizard, select Add or Remove Features and click Continue (Office 2007) or Next (earlier versions). If you get a page containing check boxes for the Office applications, plus another check box labeled Choose advanced customization of applications, check that box. Once the Update button changes to Next, click it.

In the resulting feature list, expand Office Shared Features and then Converters and Filters. Select what you want; then click Update (or Continue).