this information can help alot:
Service Pack Version: A disc with Service Pack 3 (SP3) will have more files than one with SP2 or the original RTM (Release To Manufacturing) version, as service packs include numerous updates and bug fixes.
Edition: While the core files are similar, there might be slight differences between Windows XP Home, Professional, Media Center Edition, or Tablet PC Edition discs.
Language: Different language versions would naturally have different sets of language-specific files.
Roughly speaking, we need to go through all the XP options
