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From WiX Wiki at MindCapers

Example

    <Property Id="SEARCHFORNET20">
         <RegistrySearch Id="RegistrySearch2" Root="HKLM" Type="raw"
             Name="Install" Key="SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727"/>
    </Property>

WiX v2 Deprecation

>   I'm trying to maintain an old .wxs file generated a while ago by 
> decompiling a Visual Studio-generated .msi. It contains a 
> <RegistrySearch ?type=?Registry?> node which doesn?t appear to be 
> supported any more. (2.0.4611 doesn?t like it; 2.0.2613 does). Could 
> anyone tell me what it did, and what I should update it to? The full 
> context is as follows:

Type='registry' is not supported (it was deprecated for a long time...)

You should replace it with Type='raw' probably.

Here is actual help for Type attribute:

This attribute's value should be one of the following:

directory

Sets a directory path from the registry value.

file

Sets a file path from the registry value.

raw

Sets the raw value from the registry value. Please note that this value will contain a prefix as follows:

• DWORD: Starts with '#' optionally followed by '+' or '-'.
• REG_BINARY: Starts with '#x' and the installer converts and saves each hexadecimal digit (nibble) as an ASCII character prefixed by '#x'.
• REG_EXPAND_SZ: Starts with '#%'.
• REG_MULTI_SZ: Starts with '[~]' and ends with '[~]'.
• REG_SZ: No prefix, but if the first character of the registry value is '#', the installer escapes the character by prefixing it with another '#'.