WHY

@echo off
for /f "tokens=1-2* delims==_" %%i in ('dir /b /a-d "*=*_*"') do (
    ren "%%i=%%j_%%k" "%%i_%%k"
)
pause
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PowerShell -c "dir *=*_*.* | ren -newName { $_.Name -replace '=[^_]*' }"
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