@RabSmith
Since it is a "Clean Install" installation, that sounds like it is just an incorrect file type association. You should be able to change it. Right-Click on the file in Explorer and follow the prompts.
Quote:..yes, its Microsoft PAINT files that over-ridden my XCF files, which up until now were GIMP, this has never happened before over a decade of fairly heavy GIMP use, so I never bothered to make backups, seeing as it was unexpected.
Since it is a "Clean Install" installation, that sounds like it is just an incorrect file type association. You should be able to change it. Right-Click on the file in Explorer and follow the prompts.