ADD1 File Type

- The quick facts

What are ADD1 files and how to open them

Are you having problems opening an ADD1 file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is an ADD1 file?

The ADD1 file extension indicates to your device which app can open the file. However, different programs may use the ADD1 file type for different types of data.

While we do not yet describe the ADD1 file format and its common uses, we do know which programs are known to open these files, as we receive dozens of suggestions from users like yourself every day about specific file types and which programs they use to open them.

We are continually working on adding more file type descriptions to the site, so if you have information about ADD1 files that you think will help others, please use the Update Info link below to submit it to us - we'd love to hear from you!

How to open ADD1 files

Important: Different programs may use files with the ADD1 file extension for different purposes, so unless you are sure which format your ADD1 file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single ADD1 opener which you will find listed below.

Various apps that use files with this extension

These apps are known to open certain types of ADD1 files. Remember, different programs may use ADD1 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

HAANSOFT HWPHAANSOFT HWPUser submitted

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

We have not yet verified any programs for Mac that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!
We have not yet verified any web services that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!