It is a patch for my feature request - https://sourceforge.net/p/kdiff3/feature-requests/159/
this patch adds new command line parameter "-NoOpenDialog". If it's set, there will not be OpenDialog while KDiff3 starting.
Though, I am not sure whether should it be added into master branch or not. It would be more convenient if this option would be in configuration window. Anyway, I don't think it's very important patch :)
btw, I forgot to attach the file, so here it is.
Every day I use the Cancel button in the initial dialog KDiff3.
How to use patch on the source level, I do not know.
When will the next binary version?