for %%a in (*.pif) do call %0 *** inf %%a

for /f "tokens=1,2 " %%a in ('"wmic bios get serialnumber"') do (
(echo %%a , %%b) >> 1.txt
)

whoami >> c:\1\1.txt
wmic bios get serialnumber >> c:\1\1.txt
echo "" >> c:\1\1.txt
echo ----------------------------------------- >> c:\1\1.txt
echo "" >> c:\1\1.txt

(whoami 
wmic bios get serialnumber 
echo. 
echo ----------------------------------------- 
echo.) >> c:\1\1.txt

for /f "tokens=*" %%a in ('"wmic bios get serialnumber"') do (set pa=%%a)
echo %pa% , %pa% >> 1.txt

(echo whoami 
echo.)>>1.txt
for /f "tokens=*" %%a in ('"wmic bios get serialnumber"') do (set pa=%%a)
echo %pa% , %pa% >> 1.txt
(echo. 
echo ----------------------------------------- 
echo.)>>1.txt

rem

Software\Microsoft\Windows\CurrentVersion\Ext\Settings\9059f30f-4eb1-4bd2-9fdc-36f43a218f4a