The file in question is defined as a PUP (Potentially Unwanted Programme). These are programmes that can be used for good or bad and Avast has no way of knowing which use it is being put to.

Looking at the screenshots it appears to be part of a theme programme, if you are happy with that programme then you can ignore the detection

However, if you use the PUP detection settings you will get these alerts. I personally never use the PUP setting ;D