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registry check using .BAT file

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Hi, I want to check a value in the registry using a batch file...(It is actually checking whether a software is installed or not). If that value exists, i want to quit the batch file. If that value not found, it will execute another .exe from a folder. How this is possible using a batch file........please help me....... Thanks in advance....

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Something like this seems to work:

@echo off
reg query HKCU\Software\Winamp
if errorlevel 1 goto not_exist
goto exit



Where "HKCU\Software\Winamp\" is obviously the key to query, and program_name_to_run is the name of the program to run if the key doesn't exist.

Although, why do you want to do this from a batch file rather than the exe itself?

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