Windows – Creating symlink for C:\Program Files

The argument order is

ln -s link-target new-link

So you'd want

ln -s /home/data/A /home/B
       ^--existing  ^----new link
          file/link

Update: I'd forgotten the -s flag in my sample, so it was trying to create hard links, which WILL traverse symlinks to try and point at whatever the link is pointing at. With symlinks, you can nest them as deep as you want:

marc@panic:~/b$ touch z
marc@panic:~/b$ ls -l
total 0
-rw-r--r-- 1 marc marc 0 2011-10-31 13:36 z
marc@panic:~/b$ ln -s z y
marc@panic:~/b$ ln -s y x
marc@panic:~/b$ ln -s x w
marc@panic:~/b$ ls -l
total 0
lrwxrwxrwx 1 marc marc 1 2011-10-31 13:36 w -> x
lrwxrwxrwx 1 marc marc 1 2011-10-31 13:36 x -> y
lrwxrwxrwx 1 marc marc 1 2011-10-31 13:36 y -> z
-rw-r--r-- 1 marc marc 0 2011-10-31 13:36 z

By using mklink /D you're telling it to create a directory symbolic link and D:\test\11.txt is not a directory. So if you try to access the directory C:\11.txt it will give you an error.

Just leave out the /D and it should work.