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Sometimes when I view an image (just an image, something like, it sometimes opens up the image and other times I am asked which program I want to use to view the file.

Why is that?

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This is usually configured on the host site.

Sometimes the host wants to force the download as shown in this example here.

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It has something to do with the mime-type being sent by the web-server not matching the extension for that mimeType on your computer.

Poke around:

HKCR\MIME\Database\Content Type

i don't know the specifics. i've looked into it a few times in the past; but i've forgotten.

But it can be the fault of a mis-configured web-server; sending you a .jpg when with a Content-Type of image/gif.

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