problem with updating binary files

"Dariusz Drezno" <[email protected]>
Newsgroups gmane.comp.java.netbeans.modules.javacvs.devel
Message-ID <006701c20aeb$61e49d80$5907840a@pcdrezno> 
Hello,

I don't know why if I have two or more revisions of binary file, and I try
update it, my files are shorter.
For instance:
1. I add file a.doc (revision 1.1, size 19456)
2. I add new revision of a.doc (revision 1.2, size 19456)
3. I try update revision 1.2 or revision 1.1
4. I get a.doc with size 19448 !

Why? Should I add binary files with some special option?
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