Are you aware of what an ICA file is. We provided a brief explanation of what is an ICA file in this post. ICA files are used by Citrix Client files. They are used by Citrix client applications to connect to Citrix XenApp, Citrix XenDesktop, and additional Citrix server applications. It is a protocol that explains how to transport data, including audio and video, from a server to a client and how to interact with a remote computer.