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

Microsoft acquired Axtapa Systems and later developed the Microsoft Dynamics AX software that uses files appended with the ALD extension. These ALD files are also known as Application Label data files and its content is referenced by the Microsoft Dynamics AX, which happens when users creating or editing the associated project output file (using the Microsoft Dynamics AX application) want to enter form data into those project output files. The content of these ALD files are text messages entered by the user for forms found in the project output file that was saved using the Microsoft Dynamics AX program, and these ALD files are automatically created by the software upon saving the main project output file. The Microsoft Dynamics AX software also associates these ALD files to the corresponding project output files for quick and easy referencing and retrieval when the user wants to view the content of those project output files. Users of Microsoft Windows-based platforms can install the Microsoft Dynamics AX program to start creating, opening or editing projects and to also integrate support into their systems for the ALD file format. The Microsoft Dynamics AX software is classified as a business productivity application.

Launch a .ald 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 .ald 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 .ald files aren't yet associated with it. In this case, when you try to open a .ald file, you can tell Windows which application is the correct one for that file. From then on, opening a  .ald file will open the correct application. Click here to fix .ald file association errors

Be careful not to rename the extension on .ald 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, .ald. 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.