XnView Software

Double-clicking locally-stored .HTML files

I'm getting the following error message when I double-click any locally-stored HTML file:

Format of the file <123456.html> could not be determined.

For displaying of less common formats, the following option is available:

Options>General>[x]Display all image file types.

CNTL+ALT+DEL shows that XNView is running when it shouldn't be!?

.html is associated with XnView???

Could the .html extension somehow have become associated with XnView in Windows, or could the locally-stored .html files somehow have acquired an image file type extension?

Edit:

I see the file extension is .html in the error message you posted, so seemingly a Windows file association issue...