You're here because you have a file that has a file extension ending in .or4. Files with the file extension .or4 can only be launched by certain applications. It's possible that .or4 files are data files rather than documents or media, which means they're not meant to be viewed at all.

The .or4 is another extension used for files that users created using Lotus Organizer. Files with the .or4 extension are called organizer files because they contain information usually entered into an organizer such as calendars, schedules, tasks, to-do lists, and other data that users want to record. Since the Lotus Organizer contains these saved files, it is called electronic day planner as users no longer need to jot down their schedules and other information on pen and paper. This electronic organizer allows users to easily and quickly record all their tasks, their schedules, etc. so their records are more organized. This software is very helpful in personal and business aspects. Files with the .or4 extension can only be opened with the Lotus Organizer software. This can either be version 97 or later versions of the software. But these files can be edited and converted using editing and converting software in order for users to open them even without the Lotus Organizer software.

Launch a .or4 file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .or4 file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .or4 files aren't yet associated with it. In this case, when you try to open a .or4 file, you can tell Windows which application is the correct one for that file. From then on, opening a  .or4 file will open the correct application. Click here to fix .or4 file association errors

Be careful not to rename the extension on .or4 files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .or4. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.