The problem is almost certainly that the default program your computer
wants to use is Excel and that the icon displayed for the file is therefore
an Excel icon. The file content is unaffected in this case. There are two
things you can try to open the file. I assume you are using Windows. I am
not on a Windows machine at the moment, so I have to rely on my memory.
Please excuse an errors in my instructions.
Method 1. Start OpenOffice by clicking on the Windows button and searching
through the available programs. Once OpenOffice is running, use the menu
File -> Open to navigate to the file.
Method 2. Right click on the file icon and select Open With. OpenOffice
should be on the list of available programs. Before selecting OpenOffice,
look to see if there is an option something like "Always use this program
for files of this type". Select that option if it is present and then
If the above does not solve your problem, please ask on the user forum:
https://forum.openoffice.org/en/forum/ You will have to register but that
is the more appropriate place to ask questions like this. If you prefer
mailing lists, there is a users mailing list intended for this type of
support. This mailing list is for developers.