Onetoc extension is associated with ms onenote 97-2003 index table. You have chance to open onetoc files with MS onenote.
Onetoc extension stands for index table. These file formats are found in Microsoft operating system onenote 97-2003. Onetoc files can be opened by Microsoft onenote. If you need an alternative program, you may try other Office type of softwares that can be downloaded free via internet.
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