File sending problem in chat server

Question

Hi friend,
I am new in network programming and trying to develop a chat messenger. for this most of the portion has completed but still i have some problem with file sending to anothe user,
files like .zip,.jpeg ,though the file is transfer through socket and well accepted by the user ,but i cant understand where is the mistake i have done , only text file i can transfer to another user,or it also readable ,even word file i cant read the word file which is accepted by the another user.file transfer is successfully occured but the file is not readable(Document) or viewable(Image)
if any one have the solution of this problem please help me....


Thank you in advance...
Ranjan