What is the file path syntax when importing?

What is the correct syntax to use for filenames when importing in osx? I've tried a bunch of things but keep getting an error telling me it's not a valid file or folder object. Thanks.

var myImportOptions = new ImportOptions();

myImportOptions.file = "path/to/import/file.mov";  <---??

app.project.importFile(myImportOptions);