The file headers (IMAGE_FILE_HEADER) contains information about a PE file’s sections, characteristics, and additional information.
typedef struct _IMAGE_FILE_HEADER {
WORD Machine;
WORD NumberOfSections;
DWORD TimeDateStamp;
DWORD PointerToSymbolTable;
DWORD NumberOfSymbols;
WORD SizeOfOptionalHeader;
WORD Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;
This structure is documented here: https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-image_file_header