You're here because you have a file that has a file extension ending in .ad3. Files with the file extension .ad3 can only be launched by certain applications. It's possible that .ad3 files are data files rather than documents or media, which means they're not meant to be viewed at all.
what is a .ad3 file?
An Adaptive PCM sound voice file is integrated with ADPCM (Adaptive Pulse Code Modulation) audio encoding specifications that are used to store the audio data of these Adaptive PCM sound voice files in the AD3 format. 3-bit/sample compression specifications are also implemented into the audio content of these Adaptive PCM sound voice files to compress the audio data before saving it in the AD3 format. Headers define the sampling rates integrated into an Adaptive PCM sound voice file, and this is done for a supported digital audio player to be able to play the audio content stored in the Adaptive PCM sound voice file. These 3-bit/sample compression specifications are implemented into an Adaptive PCM sound voice file at a 3000-sample per second rate. These Adaptive PCM sound voice files are affixed with the .ad3 extension.
how to open a .ad3 file?
Launch a .ad3 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 .ad3 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 .ad3 files aren't yet associated with it. In this case, when you try to open a .ad3 file, you can tell Windows which application is the correct one for that file. From then on, opening a .ad3 file will open the correct application. Click here to fix .ad3 file association errors
applications that open a .ad3 file
ZFax
ZFax
ZFax is fax software that allows users to use their Zaurus to send and receive fax, which is why Zfax is also called a GUI frontend for efax within the platform Zaurus SL5500 Linux PDA. This software features sharing of phonebook to the internal address book as well as it also features manual dialing. It also comes with a feature called external tiff viewer, by which users can save images no matter what format they are saved in. ZFax also features a Shell processing where it does every system call and makes process management an optional task. The tiff viewer that this software features gives users the ability to export TIFF images in different format, such as JPG, BMP, etc. ZFax is also known to be exclusively built for Zaurus and SharpROM, and features such as English screenshots, log viewer, converter, as well as favorite places editor are currently being equipped for Zfax to help Zaurus users in easily faxing their documents via Zaurus.
a word of warning
Be careful not to rename the extension on .ad3 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.
what is a file extension?
A file extension is the set of three or four characters at the end of a filename; in this case, .ad3. 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.
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Find and repair file association errors preventing this file type from opening on your computer.