On a search, I found this...
This file belongs to product Avast. This is executable file. You can find it running in Task Manager as the process aswoffertool.exe.
Product: AVAST Software Security
Description: avast! Offer Installation Tool
Version: 7.0.0.0
MD5: A786ADEFE38B4879DDC2C968FA32B8E1
SHA1: 131A7B5114E60E424C3DF1A4745FD9C45852643B
SHA256: 6AE649137817C40EE7451A89DB7D979F414421223101B05FCC5844DC19EC59E2
Size: 3394856
Directory: %TEMP%\_av_sfx.tm~a05656\aswOfferTool.exe
Operating System: Windows 7
Discovered: Jun 29 2012
Did you just upgrade or install version 7.0.1451?