You're here because you have a file that has a file extension ending in .azw. Files with the file extension .azw can only be launched by certain applications. It's possible that .azw files are data files rather than documents or media, which means they're not meant to be viewed at all.

Data files also refer to project output files of ebook reader programs, and these data files may also be used by ebook authoring and editing applications. Amazon developed the AZW format as the project output files integrated with specifications and standards used by the Amazon Kindle reader device. These Amazon Kindle ebooks are files appended with the .azw extension, and there are versions of the Amazon Kindle reader application that can be installed in computers running on Microsoft Windows systems. There are also versions of this software that were developed for Mac platforms. Also called Amazon Kindle ebook files, the content of these AZW files includes the content of the ebook itself, formatting attributes and page layout elements implemented by the author of the ebook into its content, and markers for the different chapters of the ebook may also be found in an AZW file. The Amazon Kindle device is a digital ebook reader integrated with wireless functionalities and a design intended for optimal portability. Linux users can install and use the Cool Reader application to open and view the content of an AZW file, and there are also versions of this software for Microsoft Windows environments. DRM (Digital Rights Management) specifications may be implemented by the author of an AZW file into the Amazon Kindle book, so the content of the .azw file can only be viewed using the Amazon Kindle device, though Microsoft Windows users can change the extension of the Amazon Kindle file from AZW to PRC, then use the Mobipocket Reader software to open the file.

Launch a .azw file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .azw file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .azw files aren't yet associated with it. In this case, when you try to open a .azw file, you can tell Windows which application is the correct one for that file. From then on, opening a  .azw file will open the correct application. Click here to fix .azw file association errors

Be careful not to rename the extension on .azw files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .azw. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.