Files with the extension .AVM are associated with 'AVG' anti-virus software.

AVG anti-virus software utilises a number of mechanisms to search for and remove viruses, tojans, worms, etc.

The incavi.avm file appears to be an incremental file related to virus updates downloaded for the AVG software.

Incremental files update only changes or new information that have occured since the last update, reducing the amount of data needed to be transfered per update.

The incavi.avm file is by default located:

Application DataGrisoftAvg7Dataavg7updackup