通常是bin啊。其实都是随意的。我给你写一个看 include <stdio.h> include <stdlib.h> int main(int argc, char *argv[]){ FILE *fp=NULL;int tmpi=1234;fp=fopen("tmp.bin","wb");fwrite( &tmpi, sizeof( int ), 1, fp );fclose(fp);} 好久不写了,有些生涩。