@mornauer: First of all: it seems to me that this has nothing to do with the topic you follow. Am I right?

To your question: It is hard to tell. Can you try to specify IOP address instead of domain/host name?

With my PC WINSCP3 works normaly.
Recently I have downloaded winscp3.7.5 beta to my notebook with the same implements.
Result: "host does not exist"
What is wrong?

I have not known about this problem. Thanks for pointing my attention to it. I'll fix this in the next version (within about week).

Is there an update on work for this DoS using the registered URL types?
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As work-around remove the keys and from your registry.

macoo