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How can I append data to a Windows registry value in a batch file?

reg.exe seems to only support create/delete keys and values - I want to take an existing REG_MULTI_SZ value and append some more data to it.

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Read the registry value into a variable (using "REG QUERY ...")and then modify the variable (append)... and then write it back to the registry. –  Logman Jul 23 '12 at 16:59
    
Can you give an example? I don't know how to parse the output in a batch file –  snowcrash09 Jul 24 '12 at 13:14
    
it would be easier if I knew what reg value you are attempting to modify, and what you are changing...is it hardcoded? are you passing a variable? Otherwise I could paste example code for each individual task but it would still have to be changed (bat code). –  Logman Jul 24 '12 at 16:06
    
Can you use PowerShell instead? If so I could provide some sample code. –  Chris N Aug 1 '12 at 2:31
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