Conversion Wizard - Index Key Information
For indexed files, use this dialog box to specify the keys.

Keys

Keys are specified using the following format:
Offset-1, length-1 [/offset-2, length-2] ...
Offsets and lengths are numbers of bytes.  Offset values start at 1.
Where keys have multiple parts use a "/" (slash) to separate the parts.
Example: "1,10/15,5"
(This is a two part key, the first part is 10 bytes long starting at the first byte, the second part is 5 bytes long starting at the 15th byte).

Duplicate Key

Check this box when duplicate keys are allowed.