Success: I deleted the manual extracted mingw-folder and restarted `finish.exe`, which subsequently downloaded the appropriate mingw-package.
Thanks to you both for the help. Now what if I wanted to create 32-bit-executable? In my understanding I have to download mingw32 additionally and invoke the nim-compiler using `--cpu:i386` , but that alone won't do it, I assume, because the path is set to the 64bit-mingw.
