Notes about the XS4 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 XS4 file type is primarily associated with 'XESS' by Applied Information Systems, Inc.. XESS is an extensible X Windows real-time spreadsheet for Linux, UNIX, VMS, and Windows NT.
Detailed information for file extension XS4:
Primary association: XESS
File classification: SpreadsheetIdentifying characters
Hex: 30 3A 3A 58 53 , ASCII: 0::XS
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database
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.