I can't run .jar files the way they used to before with MC (The little prompt box telling you to close MC and install the mod.) I switched computers to a comp on Win10, and it asks me to pick an App to execute with. Picking the minecraft launcher doesn't work. It just doesn't run at all, no option in the 'profile' for it anywhere. Can anyone help?
In the windows search box type Run. When Run pops up type %appdata% and hit Enter. Locate .minecraft and locate the mods folder which should be there if you have installed Forge. Drag and drop the .jar file into the mods folder and load up Minecraft.
Or, when it pops up saying "Which App to Execute" it should automatically show up with Java Binary. I just tried on Windows 10. You don't load .jar files with the Minecraft launcher.