Please Note: If you are using ePay 1.8 or higher this issue will not affect you.
For more information on how to change the file format see article: How do I export my file format (File Template)?
We recommend that this is done by somebody in your IT department who has full access to the server and is familiar with your IT infrastructure.
If you using ePay 1.7 or lower and the system is freezing when browsing to the file location or exporting your file format please make sure that you are using .net 4.0 and not .net 4.5 on the client machines. You are able to check this through you computers programs list.
If you are unsure what version of ePay you are using please see related article: What version of ePay am I using?