File Appended can not be viewed properly in Windows

Some tricky things are happening : Our local network environment : server - Win2K, my computer Win 98 and Linux Red Hat. I have map network drive to Linux and working on File Append / Write programs. I am creating the file in append / write mode. It is getting appended / created properly. But I can not view further changes in the file once I opened it on my system. But changes are appearing on Linux. I am wondering how come I see the changes on Linux and not on Windows once I open to see it (even if I close it). It is not possible for me to go to Linux server and see the changes in file every time. Can anybody help ? Manisha