.HSI File

File extension hsi seems to be mainly related to Image Alchemy, a picture image viewer and editing software for Microsoft Windows developed by Handmade Software. The program seems to have been discontinued years ago.

An .hsi file stores picture image created and saved in the program.

How to open:

Use Image Alchemy to view or edit .hsi bitmap images.

How to convert:

Most raster graphics files can be converted to other similar formats, it's just a matter of export in the original software.