Manually register/unregister Esri COM tool DLLs (https://gis.stackexchange.com/questions/4129/how-to-register-dll-extension-with-esriregasm-exe

esri-register-dll.bat

@echo off
echo.
echo. Manually registering custom ArcGIS COM tools in the current folder...
echo.
setlocal
set PATH=%PATH%;C:\Program Files (x86)\Common Files\ArcGIS\bin;C:\Program Files\Common Files\ArcGIS\bin

for %%a in (*.dll) do ESRIRegAsm.exe "%%~dpna"

endlocal

esri-unregister-dll.bat

@echo off
@echo off
echo.
echo. Manually de-registering custom ArcGIS COM tools in the current folder...
echo.
setlocal
set PATH=%PATH%;C:\Program Files (x86)\Common Files\ArcGIS\bin;C:\Program Files\Common Files\ArcGIS\bin

for %%a in (*.dll) do ESRIRegAsm.exe /u "%%~dpna"

endlocal