If you already have a windows system during the installation, "edit" the partition and set a mount point. Anaconda does not save it.
Do you mean not saved in the partition editor graphical interface? If so, does it record the mount point if you tick the 'Format as' box? I am trying to determine whether this is the same as https://bugzilla.redhat.com/show_bug.cgi?id=629301
Hmm... the mount point does not show up in the list... I am not sure it it would should up if I let it format the partition, but the other bug sounds quite similar so it is probably a dupe.
Probably best to keep this one open until it's a confirmed duplicate. I'll add a reference to this one for now.
*** This bug has been marked as a duplicate of bug 629301 ***