@echo off
:: arm directory args1
for /F "delims=" %%f in ('dir /b /s %1') do (
    :: skip folders
    if not exist "%%~f\" (
        :: skip files without .disarmed extension
        if ".disarmed" == "%%~xf" (
            move "%%~f" "%%~dpnf"
            echo "%%~f" renamed to "%%~dpnf"
        )
    )
)
@pause