Notes about the K09 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The K09 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.