because the format is proprietary and not image-based in the usual sense.
Fluke SmartView Software (Official Method)The most reliable way to convert IS2 files is through Fluke’s own SmartView software. This desktop application is designed specifically for their camera line. Open your IS2 file in SmartView. is2 file to jpg converter
Here’s a solid, straightforward explanation of converting files to JPG : because the format is proprietary and not image-based