Notes about the NORUN 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 NORUN file type is primarily associated with 'Unknown'. This appears to be an association with a folder instead of a file; the folder possibly belonging to a Yahoo! search appliance. It comes up in the full reference to Service Manager.norun. The folder appears to be located in C:\Documents and Settings\All Users\Start Menu\Programs\Startup\Service Manager.norun but specifics beyond that are unknown at present.
Detailed information for file extension NORUN:
Primary association: Unknown
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.