Notes about the SUN5 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 SUN5 file type is primarily associated with 'Sun OS 5 File'.
Detailed information for file extension SUN5:
Primary association: Sun OS 5 File
To change file associations press
Windows Key +
X 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.
