I found in gnokii.c file [version 0.6.10] putfile function gnokii opens source file as "r" and I can't send a binary file to my phone. So I modify it to "rb" and it finally can read binary file.
Src
f = fopen(nargv[0],"r");
To
f = fopen(nargv[0],"rb");

But although I can send a file and gnokii says it succeed, I can see on my phone only a 0KB file. My phone is 6021 and using 6510 driver and a DKU-5 cable.
 I can't delete it, can't modify it, and can't do any operate on this 0KB file. I think gnokii may have some bug in file transfer.