The .sai file format is an image file type generated by using the PaintTool SAI software. A SAI file contains drawings made by the user. It is also composed of multiple independent editing layers made from creating more complex artwork form.
Developed and published by SYSTEMAX Software, PaintTool SAI is a lightweight raster graphics editor and painting software with various drawing tools that are not common to other paint tools. It is designed to run on Microsoft Windows series. The stable version of software (v1.2) was officially released in the first quarter of 2014.
Edited paintings and new projects made by using the PaintTool SAI are often saved in .sai format, which can also be exported to .psd format when the user wants to edit it using Adobe PhotoShop. Moreover, .sai files are proprietary in nature. Opening them in other image editing software may not be possible without exporting them in another format or without using the software mentioned above.
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If you have additional information about the SAI file format or software that uses files with the SAI suffix, please do get in touch - we would love hearing from you.