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Use Another Program
If you can’t view the ONETOC2 file by double-clicking it, try opening it in a different program. One of the most popular programs for opening ONETOC2 files is OneNote. Check out the developers’ websites, download one or more of these programs, then try to open your ONETOC2 file again.
Get a Clue From the File Type
One file extension can be used for multiple types of files. Knowing the type of file you have can help you find out how to open it. Most ONETOC2 files are categorized as Settings Files, which can be opened by numerous software packages. See if you have a program already installed on your computer that’s designed to open Settings Files. Hopefully, this program might also work with your ONETOC2 file.
You can find out which type of file your ONETOC2 file is by looking at the file’s properties. Just right-click the file icon and select “Properties” or “More Info.” On a Windows computer, the file type will be listed under “Type of File”; on a Mac, it will be under “Kind.”
Contact a Developer
Nobody knows more about file extensions than software developers. If you can’t open your ONETOC2 file using any of the usual programs, you can contact the program’s software developer and ask them for help. Find your program’s developer in the list below:
| Software | Developer |
|---|---|
| OneNote | Microsoft Corporation |
Get a Universal File Viewer
When no other program will open your ONETOC2 file, universal file viewers like File Magic (Download) are here to save the day. These programs can open many different types of files, so if none of the above tips work, a universal file viewer is the way to go. Note that some files are not compatible with universal file viewers and can only be opened in binary format.
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