Passing multiString values to installer through command-line - wix

Question

I have an WiX installer configured like this:
<Property Id="MY_PROPERTY">
...
<Registry Name="MyValue" Type="multiString" Value="[MY_PROPERTY]" />
Now I want to pass this property value at the command line as a list:
MsiExec.exe /i MyInstaller.msi /qb MY_PROPERTY="One[~]Two[~]Three"
However, the installer does not split the values into a list and the literal value is written instead.
If I hard code the element it works properly:
<Registry Name="MyValue" Type="multiString" Value="One[~]Two[~]Three" />
Does anyone know how to specify a list of values at the command-line for a multiString registry value? Thanks in advance

Answer 1

Better late than never!
This can be achieved using a Custom Action.
Follow this MS document carefully: https://learn.microsoft.com/en-us/windows/win32/msi/registry-table
In your custom action, insert the registry value into MSI table from your property as follows,
Set db = Session.Database
set oView = db.OpenView("INSERT INTO `Registry` (`Registry`,`Root`,`Key`,`Name`,`Value`,`Component_`) VALUES ('reg_MY_PROPERTY', -1,'Software\Company\Product','MyValue','" & _
Session.Property("MY_PROPERTY") & "','CM_CP_BlahBlah') TEMPORARY")
oView.Execute
oView.Close
CM_CP_BlahBlah is your WIX component Registry values are attached to.
Please note "custom action must come before the RemoveRegistryValues and WriteRegistryValues actions in the action sequence"
<InstallExecuteSequence>
<Custom Action="SetMyPropertyCustomAction" Before="RemoveRegistryValues">NOT REMOVE</Custom>
</InstallExecuteSequence>

Answer 2

REG_MULTI_SZ
A sequence of null-terminated strings, terminated by an empty string (\0).
The following is an example:
String1\0String2\0String3\0LastString\0\0
The first \0 terminates the first string, the second to the last \0 terminates the last string, and the final \0 terminates the sequence. Note that the final terminator must be factored into the length of the string.
So as per this LINK you should be doing this:
MY_PROPERTY="One\0Two\0Three\0"
For MULTISTRINGValues check this element: MULTISTRINGVALUE