How to open 660 files
Did your computer fail to open a 660 file? We explain what 660 files are and recommend software that we know can open or convert your 660 files.
What is a 660 file?
The 660 file extension indicates to your device which app can open the file. However, different programs may use the 660 file type for different types of data.
While we do not yet describe the 660 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 660 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!
Update info Upload example file
Generic 660
These apps are known to open certain types of 660 files. Since many different programs may use 660 files for different purposes, you may need to try a few of the apps to open your specific 660 file.
 | UltraZip | User submitted |
 | Pro/ENGINEER | User submitted |
 | Creo Elements/Pro | User submitted |
| Creo | User submitted |
| Pro ENGINEER | User submitted |
 | Startup TOOLS | User submitted |
| ProeWF3 | User submitted |
 | UltraZip UI | User 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.