Notes about the K03 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 K03 file type is primarily associated with 'Clarion' by SoftVelocity. The .DAT file is usually associated with .K## (##=numbers) key files that are indexes into the data. There may also be a .MEM memo file. This is a structure used by DOS versions of the software. If the .K## files are not available and are not automatically rebuilt you can use the oldest DOS version of Clarion Professional Developer to build them.