Hi rookie,

> Working on a big project, which I backed up to an external drive. Today when
> I try to open my file, I get a "file not found" error. What do I do?

Are you able to locate the file using the regular operating system file browsing stuff?

Did you maybe "Move" the file to the external drive, rather than just make a copy of it to the external drive? If so then it's on your external drive now so like Brian says above plug that in and look on it.

- Michael