Laserfiche is most likely treating it as an electronic document and this sounds like an error I've gotten before when Laserfiche couldn't directly modify the file in the repository. The intent isn't to modify the file, but when you open it up Laserfiche is just returning a copy of the file and invoking the local shell handler. Once the handling application takes the file, Laserfiche has no guarantee of what happens to it. I believe that's what the warning is indicating.