Reference/ReadRegDWORD
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ReadRegDWORD
user_var(output) root_key sub_key name
Reads a 32 bit DWORD from the registry into the user variable $x. Valid values for root_key are listed under WriteRegStr. The error flag will be set and $x will be set to an empty string ("" which is 0) if the DWORD is not present. If the value is present, but is not a DWORD, it will be read as a string and the error flag will be set.
ReadRegDWORD $0 HKLM Software\NSIS VersionBuild
Command introduced with NSIS v1.50
