[megaloman]

Код:

@Echo On
Set In=card.txt
Set InTmp=%In%.Tmp

SetLocal EnableExtensions
SetLocal EnableDelayedExpansion

Move /Y "%In%" "%InTmp%" >Nul

If %ErrorLevel% EQU 0 (
   FOR /F "usebackq tokens=1,2,3 delims=;," %%a IN ("%InTmp%") DO (
      If %%b GEQ 0 Echo %%a,0.%%c>>"%In%"
      If %%b LSS 0 Set /A bb=-%%b & Echo %%a,!bb!.%%c>>"%In%"
   )
   Del "%InTmp%" >Nul
)