1SP File Extension
Microsoft OneNote Mobile Document
- File Type 1sp
- Developer Microsoft Corporation
- Popularity
- Application Microsoft One Note Mobile
- Category Document Files, Smartphone Files
What is a 1SP file?
The 1SP file extension is linked to Microsoft OneNote Mobile Document and belongs to the categories of Document Files and Smartphone Files, which include 1038 files.
The Microsoft OneNote Mobile Document (1SP) was developed by Microsoft, which created file format and 242 programs to work with them.
1SP files are compatible with various operating systems, including mobile platforms such as Apple iOS. To open a 1SP file, you can use software like Microsoft One Note Mobile.
How to open a 1SP file?
If you cannot open a 1SP file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.
Microsoft One Note Mobile is the preferred application for opening and managing 1SP files, recognized for its widespread use. To set up the newest version of Microsoft One Note Mobile on your device, simply go to the official Microsoft website. There you can download the edition compatible with every operating system.
Once installed, Microsoft One Note Mobile will be set as the default program, and 1SP files will open automatically.
Set Microsoft One Note Mobile to open 1SP by default
Setting a default program by file type in Windows
- Right click on your 1SP file, then select "Open with" and click "Choose another application";
- Find the Microsoft One Note Mobile application in the pop-up window and select it as your preferred program;
- Select the "Always use this application" check box and click "OK" to save your selection as the default application for opening 1SP files.
Change default apps on Mac
- Right-click or use Control + Left-click on the desired 1SP file to access the file’s context menu;
- Select "Open in application" and click "Other";
- At the bottom of the window, find the "Enable" menu, where "Recommended Programs" is already selected by default;
- Within this menu, select "All Programs" and then locate Microsoft One Note Mobile. Check the box next to "Always open in app" to set it as the default program.
How to edit a 1SP file?
Editing 1SP files requires installing professional software that lets you open and edit document files. Online editors have more limitations compared to dedicated Microsoft OneNote Mobile Document programs.
Best 1SP editors in 2026
Considering the mentioned criteria, we have compiled a list of 1SP editors that may suit your needs.
| 1SP Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft One Note Mobile | Microsoft | Apple iOS | 4.6 out of 5 (37 reviews) |
Easy 1SP Troubleshooting
Certain problems with 1SP files can be conveniently fixed with small software tweaks. Here are some helpful tips to address them.
What are the steps to repair a damaged 1SP file?
Open the corrupted 1SP file in a recovery program and select the "Repair" menu item. Please be patient while the recovery process completes, which will automatically restore the damaged document files.
How do I know if my 1SP file is corrupted?
Corrupted 1SP document files may show the following signs:
- Attempts to open the file result in errors or failed results;
- Editing the archive in Microsoft One Note Mobile is accompanied by slow performance or delays;
- The file causes Microsoft One Note Mobile or other programs to hang or crash during operation;
- Unexplained increase in 1SP file size;
- Error messages appear while working with the file;
What are the reasons behind Microsoft One Note Mobile crash?
The likely cause of Microsoft One Note Mobile crashing is lack of software updates. Install the latest updates available for Microsoft products.
Restarting your computer is often an effective solution to resolve various common problems. Therefore, it is recommended to do so before making any changes to the software configuration.