I just switched from windows 8 to 7. I need to reinstall office 10. Downloaded fine. But when I double click the file, it asks how I want to open the file. The options don't make sense for an install. Isn't this an executable file?
It's an executable file if it's filename extension is ".exe" or ".msi".
If it's something else then it's not the installer file, and that's why it's asking you what you want to open it with.