OOS File Extension
OpenOffice.org Spreadsheet
- File Type oos
- Developer OpenOffice Project Team
- Popularity
- Application OpenOffice Calc
- Category Document Files
What is a OOS file?
The OOS file extension is linked to OpenOffice.org Spreadsheet and belongs to the Document Files category, which includes 969 files.
OpenOffice, the developer of the OpenOffice.org Spreadsheet (OOS), has released file format and 7 programs designed to handle them.
OOS files are supported by Linux, Windows and Mac OS. There are 4 programs available to open a OOS file, including popular tools like OpenOffice Calc, LibreOffice Calc and OpenOffice.
Programs that support OOS files
How to open a OOS file?
If you are having trouble opening a OOS file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.
The most popular programs for working with OOS files are OpenOffice Calc, LibreOffice Calc and OpenOffice. To install the current version of OpenOffice Calc, go directly to the official OpenOffice website. The universal package for all operating systems is available there.
After setup, the operating system should recognize OOS files and link them with OpenOffice Calc.
Setting OpenOffice Calc as default OOS viewer
Changing the default program in Windows
- Right-click on your OOS file and choose the "Open With" option. Then click "Choose another app" to continue the process;
- Choose OpenOffice Calc from the available applications listed in the pop-up window to set it as the default application to open your OOS file;
- Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.
Change the default app for a file type in Mac
- Initiate a right click or use Control + left click on the desired OOS file to open a menu where you can select various actions;
- Select "Open in application" and click "Other";
- Scroll down to the bottom of the window, and there you will find the "Enable" menu. The default selection is "Recommended Programs";
- Choose "All Programs" within this menu and locate OpenOffice Calc. Check the box next to "Always open in app" to set it as the default program.
How to edit a OOS file?
To edit OOS files, you need to install specialized software that allows you not only to open but also to modify document files. Online OOS editors usually provide fewer features than software created specifically for OpenOffice.org Spreadsheet.
Best OOS editors in 2026
Based on your described criteria, here is a list of available OOS editors.
| OOS Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| OpenOffice Calc | OpenOffice | Windows, Mac OS, Linux | 4.6 out of 5 (44 reviews) |
| LibreOffice Calc | TDF | Windows, Mac OS, Linux | 4.4 out of 5 (32 reviews) |
Tips and tricks to solve problems with OOS files
OOS files can sometimes be tricky, but minor software adjustments usually resolve the issues. Refer to the tips below for guidance.
Are there any symptoms that my OOS file is damaged?
Corrupted OOS document files may have one or more of the following symptoms:
- File hangs or crashes in OpenOffice Calc or other programs;
- Error dialogs are displayed when interacting with the file;
- The file does not open or opens with errors;
- Unexplained increase in OOS file size;
- Poor performance when editing a file in OpenOffice Calc;
Why does OpenOffice Calc crash or shut down frequently?
The absence of software updates can cause OpenOffice Calc to crash. It is recommended to install the latest available updates for OpenOffice products.
Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.
Is there any specific software or utility that can help repair a damaged OOS file?
Start a data recovery program and open the damaged OOS file. Go to the menu and select the "Repair" option to repair the file. Then wait for the recovery process to complete, which allows you to automatically repair corrupted document files.