The file has saved as an unproject file?

How do i load up my work now it has save itself as an unproject file

Your project should be listed in the library section of the Launcher and the .uproject file should be associated with the engine, so double-clicking the .uproject file should open the engine. Check your library section in the launcher at the bottom left the launcher window, once there you should see your saved project in the list just under the engine list in the My Projects section.

Will it make a difference if it is on my USB?

I’m not 100% sure, never used USB to store the project while also trying to work in it…It shouldn’t though…it is still storage just will be slow…as long as the entire project is on the USB and you have UE4 installed on the computer you are trying to open it from. Having it on a removable drive though may effect it showing up in the launcher but I don’t know for sure…might want to copy it to your internal hard drive while working on it and transfer or keep a copy of it on your USB

Ok thank you hopefully it works