| Microsoft OneNote Table Of Contents Format | |
| Microsoft | |
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ONETOC2 is a file format used by Microsoft OneNote that contains information about ordering of various note sections.
Removing ONETOC2 file will reset the sort order into default alphabetical sort. OneNote is a tool included in paid Office application package, but is also available as a free stand-alone application.
Windows
| .a2theme | Aston 2 Theme Format |
| .acb | Adobe Color Book Format |
| .acbl | Adobe Color Book Format |
| .aco | Adobe Photoshop Color Palette And Swatches Format |
| .acrobatsecuritysettings | Adobe Acrobat Security Settings Format |
| .acrodata | Adobe Acrobat Data Format |
| .acv | Adobe Photoshop Colour Curves Format |
| .acw | Microsoft Accessibility Wizard Format |