Version 1.1b5 is quite old. These tools are often flagged by antivirus as "HackTools" or "Malware" not because they harm your computer, but because they are used to analyze or crack software.
If you're trying to understand or use this tool, I recommend: unidumptoreg v1.1b5
unidumptoreg_v1.1b5.exe /I:input_dump.bin /O:output.reg /offset:0x7e000 Version 1