How to Exclude windows client drive from Avast scanning

One customer hits an error when saving AutoCAD dwg file in windows client drive. The error message is  like this: Unable to save to drawing M:\xxxxxx\xxx.dwg. Drawing saved to M:\xxxxx\saveyyyyyyyy.tmp

After some research, notice the end users are running Avast Anti Virus application. Once disable Avast, the issue goes away. 

Checked Avast settings. Customer admin figured out how to exclude the windows client drive from the scanning. Once setup like this, can keep Avast running without hitting the error anymore.

We'd like to extend our gratitude to the customer who shared their Avast configuration screenshots here. For any customers who uses Avast, we suggest you to check the configuration.