The number used in the path below refers to the last major version of LibreOffice that created that kind of profile. The format has changed from LibreOffice 3 to LibreOffice 4. You might wonder why the number has not increased with LibreOffice 5; this is because the format has not changed since LibreOffice 4 and changing that number will make lose the personal configuration of each users. If LibreOffice has to ever increase that number, it may be from 4 to none. This is why you shouldn't rely on it for your own scripts.