in reply to Re^4: Win7, ASSOCiation , and @ARGV
in thread Win7, ASSOCiation , and @ARGV

REG_EXPAND_SZ means that the value contains (or may contain) environment variables that are supposed to be expanded. Usually you have things like:

%SYSTEMROOT%\System32\Drivers

... and have to hope that the application knows how to handle REG_EXPAND_SZ.