Format of [~~.html] could not be determined. For displaying~

[merry widow]

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!?

[xnview]

.html is associated with XnView???

[cday]

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...