Finally, when will putty be able to handle by batch in ASCII?
How do I know? :-)
On their wishlist there is an item Line ending conversion in PSCP and PSFTP already. They evidenly do not want to implement that fake ASCII mode, which WinSCP does. So their only option to support for SFTP4 text mode feature (which WinSCP also supports). But the fact is (as they state also), there are very few servers yet, which support SFTP4. I know only VanDyke Shell.
The putty website is now working again, so I'll go off and bother them. :)