Notes about the WD1 file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The WD1 file type is primarily associated with 'Earth 2150' by ZUXXEZ Entertainment AG. You can open those files using the Windows Media Player application. Use open with... because the format is not registered with the Media Player.
Detailed information for file extension WD1:
File classification: Video
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.