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- People also askIf you are using C#, then you should not be using MSHTML. Use the WebBrowser component if you're using Windows Forms, use any of the XML APIs if you're trying to generate HTML (as XHTML). You might possibly want to use an HtmlWriter, but stay away from unmanaged code, if you can help it. Links: BTW, MSHTML is not a new thing - it's an old thing.stackoverflow.comYou encounter an error message such as "%%os%% Can't Open MHTML Files" when trying to open your MHTML. If so, it typically means that you don't have Internet Explorer installed for %%os%%.solvusoft.comRun a virus/malware scan of your entire system. Some mshtml.dll errors could be related to a virus or other malware infection on your computer that has damaged the DLL file. It's even possible the error you're seeing is related to a hostile program that's masquerading as the file. Use System Restore to undo recent system changes.If the individual mshtml.dll file troubleshooting advice above is unsuccessful, performing a startup repair or repair installation should restore all Windows DLL files to their working versions. Use a free registry cleaner to repair mshtml.dll related issues in the registry.