WinDisk.exe not found in System Tools to manage clients harddisk


if I select a client in Dameware 12.1 and click on "System Tools" (in the top bar) I can't use the function for management the disk of clients. A error appears with the message, that the windisk.exe was not found. I checked that on my computer an its right. I haven't the named file. Where can I download that to manage the space of my clients?

I tried to create a own shortcut but if I create a new entry I can't see it in the system tools menu...

Can someone help me please? See screenshot for additional information.