Let batch file copy files into folder in REG-SZ var

Hello,
I'm trying to make a batch file which has to copy a file to a folder which can be found in the registry.
I currently have this:
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reg query "HKEY_LOCAL_MACHINE\SOFTWARE\blablabla\blabla" /v InstallPath
pause
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When I run the batch file, it shows me the correct folder which the batch file finds in the registry, although I don't know how to let the batch file copy a specific file into that folder. I can do this:
copy blabla/hkjlkj/jlk.txt hjhk/hlkjkl
and then it works completely, but how can I set the destination directory of that file to the folder it found in my registry. (the output of the above mentioned file)

Already thanks in advance!