Why do I always get the result File not RIFF?

I'm trying to make a wav player without using any libraries just solid C and x86 assembly which is compatible with DOS PC's.I am using Turbo C compiler (version 3.0) pcm and stereo aren't supported in this example (<- Because I don't know compression) Here's the code: #include #define BUFFER 43

unsigned int sd = 0;
unsigned short f = 0;

main(char *argv[]){

FILE *wav = fopen(argv[1], "r");
unsigned int datalenght,samplerate,filelenght,lenght = 0;
unsigned short pcmordd,monoorstereo,samplebits = 0;
char byte[BUFFER], *chunk;

if(wav < 0){

    printf("Can't open file!");
    exit(-1);

}else{
    if(fgets(byte, BUFFER, wav) == EOF){
        printf("Unexcepted EOF");
    }

    if(byte[0] != 0x52){
        printf("File is not RIFF!");
        exit(1);
    }
    if(byte[1] != 0x49){
        printf("File is not RIFF!");
        exit(1);
    }
    if(byte[2] != 0x46){
        printf("File is not RIFF!");
        exit(1);
    }
    if(byte[3] != 0x46){
        printf("File is not RIFF!");
        exit(1);
    }

    filelenght = (byte[4] * 16777216) + (byte[5] * 65536) + (byte[6] * 256) + byte[7];

    if(byte[8] != 0x57){
        printf("Not a valid WAVE file");
        exit(1);
    }
    if(byte[9] != 0x41){
        printf("Not a valid WAVE file");
        exit(1);
    }
    if(byte[10] != 0x56){
        printf("Not a valid WAVE file");
        exit(1);
    }
    if(byte[11] != 0x45){
        printf("Not a valid WAVE file");
        exit(1);
    }

    if(byte[12] != 0x66){
        printf("Only fmt supported");
        exit(1);
    }
    if(byte[13] != 0x6D){
        printf("Only fmt supported");
        exit(1);
    }
    if(byte[14] != 0x74){
        printf("Only fmt supported");
        exit(1);
    }
    if(byte[15] != 0x20){
        printf("Only fmt supported");
        exit(1);
    }

    pcmordd = (byte[20] * 256) + byte[21];

    if(pcmordd != 1){
        printf("Only PCM supported");
        exit(1);
    }
    monoorstereo = (byte[22] * 256) + byte[23];

    if(monoorstereo != 1){
        printf("Stereo is not supported");
        exit(1);
    }

    samplerate = (byte[24] * 16777216) + (byte[25] * 65536) + (byte[26] * 256) + byte[27];
    samplebits = (byte[34] * 256) + byte[35];
    datalenght = (byte[40] * 16777216) + (byte[41] * 65536) + (byte[42] * 256) + byte[43];

    lenght = datalenght / (samplerate * (samplebits / 8));

    printf("File size is %d", filelenght);
    printf("The file is %f seconds long", lenght);
    sd = (65535*25) / samplerate;
    while(1){
        if(fgets(chunk,(samplebits / 2), wav) == EOF){
            printf("EOF reported (end of the song)");
            fclose(wav);
            exit(0);
        }
        f = (chunk[0] * 256) + byte[1];
        makesound();
    }

    }
    return 0;
}
makesound(){
asm{
mov al, 182
out 43h, al
mov ax, f
out 42h, al
mov al, ah
out 42h, al
in al, 61h
or al, 00000011b
out 61h, al
mov cx, sd
}
pause1:
asm{
dec cx
jne pause1
in al, 61h
and al, 11111100b
out 61h, al
 }
 return 0;
}