Trying to identify a film. It's possible it was made-for-TV, or even an episode for some sort of Outer Limits-style TV show. I saw it on TV around 2000 - 2004; it was in color. It felt like something made in the late '80s or '90s.
The plot involves Nazis time-traveling to the present day. A major plot element was discovering that the Nazis were trying to steal books about World War II. Unfortunately, I don't remember much if anything about the time travel device. It felt like a family comedy -- it wasn't taking itself very seriously and had at least one kid in it.
One scene I remember is a Nazi soldier rolling a "potato-masher" grenade down a hallway into a room of a house, and someone -- possibly the kid -- picking it up and throwing it back. It's possible it was a smoke grenade; I don't recall an explosion.