For users without Excel, but with PowerShell installed (which can be found on all modern Windows versions and is downloadable for Windows XP):
Open PowerShell ISE and insert the following lines:
$code = "1234-5678-90AB-CDEF-1234-5678-90"
$delimiter = "-"
$code = $code.Replace($delimiter,"")
$code = $code.insert(21,$delimiter).insert(16,$delimiter).insert(11,$delimiter).insert(6,$delimiter)
$code
Replace the code in first line with the code, you received.
(Do not remove the "-signs around the code block.)
Run the script by clicking the green arrow.
The script will give a valid formatted code in the output, which you can copy and paste. (To avoid pasting formatting components, it helps to use Notepad as first target for paste, then copy again from there and paste it into Account management.)
Edit: Instead of a full fletched script you can also use a one line command in PowerShell:
("1234-5678-90AB-CDEF-1234-5678-90".replace("-","")).insert(21,"-").insert(16,"-").insert(11,"-").insert(6,"-")
*Salute*
Olahorand
