Calling `dir` will work here since you used the `csv` engine, but some of the SQL engines won't result in files in the working directory so I'm worried about someone doing:

```
ecoretriever::install('MCDB', 'mysql')
dir(pattern='MCDB')
```

It's not a big deal either way, I just figured that we didn't need the `dir` call in the example so why not avoid any potential confusion, but whatever way you want to go is fine with me.