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The Microsoft-specific function names strlwr and wcslwr are deprecated aliases for the _strlwr and _wcslwr functions. By default, they generate Compiler warning (level 3) C4996. The names are deprecated because they don't follow the Standard C rules for implementation-specific names. However, the functions are still supported.
We recommend you use _strlwr or _wcslwr or the security-enhanced _strlwr_s and _wcslwr_s functions instead. Or, you can continue to use these function names, and disable the warning. For more information, see Turn off the warning and POSIX function names.