Hope this gies you a good idea about what's happening: Quality of Content on the Network (click on link)

What I do is to add .wmv .jpg & .exe into my keyword filters. For LW go to LW's menu Tools, Options & Filters & Keywd Filter & press Add. Type in the word & press apply. (For mac osx that means LW's prefs & filters.) You can take these filter words out & re-Add anytime to suit you.