Opera prob

for html or php pages u mite have selected the "download" option instead of "open in web browser"

tools >> preferences >> advanced >> Downloads .... and delete the entry with file extension HTML/ php

i think this sud solve ur problem

moved here

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I f you can try that again and give the name or extension of the file it is trying to save it will be more helpful. Cos then it will help in understanding what is being downloaded cos its not visible in your screenshot.