Windows XP does have SFC, but not the same UI which you see in Windows 98. Open a command-prompt window and type SFC/? The option "Scannow" verifies and restores the core system files which are overwritten/replaced by other versions. [SFC /SCANNOW]
If you want to extract one particular file as you did in Windows 98, use the MSCONFIG Expand option or the Expand.exe command-line operation.