The engine version [1.349.149.0](https://www.microsoft.com/en-us/wdsi/defenderupdates#manual) will break mpclient. The broken version will output: ```shell ./mpclient eicar.com mpclient: function at 0x5a6a3c4c attempted to call an unknown symbol [2] 28061 trace trap ./mpclient eicar.com ```