Files with 1sp file extension are documents created in OneNote Mobile app. Unfortunately, this document is not compatible with classic Windows version.
Software that open 1sp file
1SP file extension - Microsoft OneNote Mobile document
What is 1sp file? How to open 1sp files?
The 1sp file extension is mainly associated with the Microsoft OneNote Mobile. and used for the default document format of the program.
OneNote Mobile document file is not compatible with Microsoft OneNote for desktop computers.
The default software associated to open 1sp file:
Microsoft One Note Mobile for iPhone 
Company or developer:
Microsoft Corporation
Microsoft OneNote for iPhone is a note-taking app for capturing all of your ideas and to-dos on the go, brought to you by Microsoft Office.
Company or developer:
Microsoft Corporation
Microsoft OneNote Mobile is note software that is a part of Microsoft Office for Windows Phone operating system. It can be simply synchronized with desktop variant from Microsoft Office.
List of software applications associated to the .1sp file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open 1sp file, edit 1sp file, convert 1sp file, view 1sp file, play 1sp file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting 1sp files.
Software that open 1sp file - Microsoft OneNote Mobile document
Programs supporting the exension 1sp on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open 1sp file action.
