[seriych]

Код:

For /F "UseBackQ Tokens=2*" %%I In (`Reg Query "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced"^|Find "HideFileExt"`) Do set /a key=%%J

if %key%==0 (
	reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v HideFileExt /t REG_DWORD /d 00000001 /f
) else (
	reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v HideFileExt /t REG_DWORD /d 00000000 /f
)