官方给的解决方案的网站：
https://support.citrix.com/article/CTX804493
我试了下，这个方法还是比较有用的，但是前提是安装Citrix Receiver。
Associate .ica File Type With Citrix Connection Manager
（1）On Windows computers, go to Control Panel > **Programs **> **Default Programs **> Associate a file type or protocol with a program.
（2）Under Name, find .ica file type.
（3）Ensure that the current default is set to Citrix Connection Manager. If not, click Change program and choose Citrix Connection Manager.
Note: Connection Manager is the wfcrun32 file located at C:\Program Files (x86)\Citrix\ICA Client.
