As of v2.0.22, this is not longer needed. You can instead check the box in the field options for your file upload field.
Use this code to automatically delete file uploads when an entry is deleted. No changes are necessary.

Use this to check if a field value is greater than X and less than Y. Use [if x greater_than="x" less_than="y"]Show this[/if x] in your View or email message.

Use this code to export the entries created by the current user. The user must have permission to "View Entries from the Admin area" in order for this to work.