Open up the file "metabase.xml" with notepad…should be located in C:windowssytem32inetserv. Find the variable named "AspBufferingLimit" and change it to something greater than what is there.
By default this is set to around 4 megs. By changing this variable you are increasing the max size of ASP response buffer, thus letting you download files greater than 4 megs using WexFree.
For uploading files greater than this amount, look for the variable named "AspMaxRequestEntityAllowed" and change it to the desired size.