This is a User Defined Language for Notepad++, which enables highlighting for KTM Server Logs (both KTM_*.txt and Scheduler.txt). It just makes it a bit easier to read by highlighting errors and warnings.
To use click View>User Defined Dialogue… Then click Import to import the attached xml file. After that you can select “KTM+Scheduler” from the Language menu to apply the style to any open file.