Merging of VMDK files to Single VMDK - Diskname or some other argument is missing

Question

Hi I would like merge vmdk files into one single file. I use vmware-vdiskmanager.

I tried used this cmd

C:\Program Files (x86)\VMware\VMware Workstation>vmware-vdiskmanager -r C:\Users
\Mike\Documents\Virtual Machines\Windows Server 2008 R2 x64\Windows Server 2008 R
2 x64.vmdk -t 0 singlefile.vmdk
Diskname or some other argument is missing.
VMware Virtual Disk Manager - build 528992.
Usage: vmware-vdiskmanager.exe OPTIONS <disk-name> | <mount-point>

I don’t understand this error: Diskname or some other argument is missing. because I have file Windows Server 2008 R2 x64.vmdk in this location.

EDITED:

I tried this:

vmware-vdiskmanager.exe –r "C:\Users\Mike\Documents\Virtual Machines\Windows Server 2008 R2 x64\Windows Server 2008 R2 x64.vmdk" –t 0 "singlefile.vmdk"

and this

vmware-vdiskmanager.exe –r 'C:\Users\Mike\Documents\Virtual Machines\Windows Server 2008 R2 x64\Windows Server 2008 R2 x64.vmdk' –t 0 'singlefile.vmdk'

and last this

vmware-vdiskmanager.exe –r "C:\Users\Mike\Documents\Virtual Machines\Windows Server 2008 R2 x64\Windows Server 2008 R2 x64.vmdk" –t 0 "C:\Users\Mike\Documents\Virtual Machines\Windows Server 2008 R2 x64\singlefile.vmdk"

But error is same.