Im starting already making an unattended Windows Xp installer, since my source has SP2, i skipped step 2 and 3... Right now im trying to make a winnt.sif from the setup manager wizard. After i make one, would it be a good idea if i just could use WinISO creating an image source and insert the file?

You can do that. I do it all the time. Any program like WinISO will do (MagicISO, UltraISO, ...).

It might be a good idea to first delete old winnt.sif from ISO file and then add new one. I had problems few times when i didn't delete the old file before adding new one. It might be due to a program bug (I used UltraISO).

Thanks a lot! Hmm, so i should delete first the old winnt.sif then replace it... I'll try it!

I tried making an answer file using setup manager and renamed it with winnt.sif but as i transfer it in the WinISO explorer, the filename is winnt.sif.txt??? Is this correct?

No.

Try open file with notepad and use:

Click file, save as, write winnt.sif

change "Text document" to "All files"

Click save

Delete the old file and add the new file into your ISO image.

Can i verify where can i place winnt.sif coz the i cant find right now the old file in the ISO i made from WinISO... If there's no old file can i just drag it to the directory and add it? Thanks

If it's an x86 installation, the winnt.sif file goes into the \i386 directory on the source. If it's an x64 installation, it goes into the AMD64 installation directory on the source.