Rajesh - Many popular data file formats can be exported/imported...IOK/IOM are internal Omniscope formats that can be used as sources in multi-file chains.
The listing of supported data import file formats is shown in the DataManager Data File block:
If you are new to Omniscope, please look at other tutorials, as this is a very efficient way to learn how to use different features. All the files used in the videos are available from the Demo section on the Welcome screen or in the DataManager area, under Sources.