What is the 1SP file format?
A file with the .1SP extension is a file known as Microsoft OneNote Mobile Document. This format is associated with Microsoft Corporation.
The reliable way to open a .1SP file is with software that recognises this exact format, rather than guessing from the file name. If you are not sure what created a file, our file identifier can read its first bytes and name the real format, even when the file has been renamed.
We are still gathering the list of programs that open .1SP files. A fully verified, hand-written description of this format is being prepared; until then, the details on this page are drawn directly from our database.
Format details
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