KDE 4.12, Konqueror
context menu -> create file -> plaintext -> "testfile"
fine -> a file with the name "testfile" is created
context menu -> create file -> plaintext -> "testfile.crt"
WTF -> a file with the name "testfile.crt.txt" is created
context menu -> create file -> plaintext -> "testfile.key"
WTF -> a file with the name "testfile.key.txt" is created
this is *not* microsoft windows i thought :-(