How to open Microsoft Windows Help annotation .ann files
Have you had trouble opening the ann file on your computer? What are ann files? We explain what they are and recommend software that we know will open them.
What is ann file?
An ann file extension is related to the Microsoft Windows Help, a Windows Help viewing tool and used for its annotation files.
Microsoft Windows Help annotation description
The ann file extension is associated with the Microsoft Windows Help system used for browsing in the help documents distributed with the Windows operating system.
The ann file stores annotation.
Suggested software to open ann file

Microsoft Windows Help
A software for making help files for Windows programs
There are other ANN filename extensions with the same .ann suffix
ann - ENVI saved map annotation
An ann file extension is associated with the ENVI app for Microsoft Windows. An ann file contains saved map annotation.
ann - King-FIX data
An ann file extension is related to the King-FIX and used for its data files.
ann - Lingvo dictionary annotation
An ann file extension is related to the Lingvo dictionary annotation data file format.
ann - ZEMAX annotations
An ann file extension is related to the ZEMAX, a modeling tool for Windows. An ann file contains annotations.