[gora]

Попробуйте так:

Код:

@Echo Off
Set FoldTXT=e:\Temp\1
Set Arch=e:\Temp\1\2\A.ZIP

For /R "%FoldTXT%" %%i In (*.txt) Do Set /a size +=%%~zi
For /F %%i In ('""C:\Program Files\7-zip\7z.exe" l "%Arch%""') Do Set sizeArch=%%i
If "%size%"=="%sizeArch%" Del /Q /F "%FoldTXT%\*.txt"

Пути укажите свои