Hello, and welcome to the forums!
rmv files are actually bik files, which can be accessed with Bink Video! software, made by RAD Game Tools.
lmlm files can be decompiled by the mod launcher, though some might be encrypted and not decompilable.
To decompile a lmlm file, you put the file in your Mods directory, then run the launcher. If you see the mod in the list, right-click it and then click "Decompile" and decompile it to any convenient path.