Do these window trim strips (shown pulling up from the metal frame) perform any useful function, or are they purely decorative?
If functional, how to replace them?
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These strips are not for decoration. When the windows are new, they fit into the groove very tight and help to secure the glass after the window caulking/sealer has been applied between the aluminum frame and glass. They also keep water and dirt from filling up the groove and provide some weather stripping although the caulking/sealant usually does that. I have seen glass fall out of the frame when stripping like this has been rempved and not replaced. If it's still pliable, clean it off with soap and water and wedge it back into the frame like the right side of your picture shows. If it's dried out, cut a pieces so you can match the profile at your home / window store or the internet and re-install.