I'm using KG-Chart (windows version) and I can't import a file created with StitchSketch

A file created with StitchSketch (*.sthmb) uses a different format than a file created with KG-Chart on MS-Windows. Unfortunately, the format and data included in a file are totally different and it is not possible to do so due to the totally different architecture and design of those program.
The reason the format is different is that StitchSketch is based on newer design strategy where the color and palette data are separated, symbols now using Unicode, and etc.

If you want to convert, here is a workaround:

StitchSketch to KG-Chart

Export a chart as an PNG image, then import it in KG-Chart.
Symbols are automatically re-assigned with KG-Chart version. Colors also will be replaced with palette version you select in KG-Chart

KG-Chart to StitchSketch
Since StitchSketch ver 1.02, you can convert an image into a chart. So, you will be able to import a data after exporting a chart as x1 zoom in PNG format on KG-Chart. No backstitch will be converted.

Where is a palette for threads?
As of ver 1.04, StitchSketch comes with color palette.

I want to convert a photo into a chart. Can I do that?
Since ver 1.02, you can convert a photo to a chart.