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Hi peardox,

Xzip can store any binary formats, including image files, but they would have to be briefly extracted to a temp location and then imported to GameMaker (the temp file could then be deleted).

A more straightforward way would be to use surfaces rather than sprites, then use the xzip_write function to store the image data directly within an archive. The xzip_read function can then fetch the image data without the need for extraction to a temp location first.

Both approaches have their pros and cons, so which is preferable simply depends on the demands of your project.

Temp file storage breaks license terms - particularly as there are undelete utilities.

Surfaces are not a solution here as a 4k x 4k RGBA takes up 67,108,864 bytes and GZ compression won't get that back to PNG sizes (only PNG will do that). 

Guess a decode buffer to surface extension is required...