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What is msdia80.dll?

Jackfrost -  
 Io -
Hello, here's a detail that's bothering me with my external hard drive. I've had it for 2 years with no issues; I store all my movies and manga on it. Tonight, when I wanted to add a movie, I noticed this file msdia80.dll that I had never seen before. What bothers me is that it was created on 12/1/2006 at 10:37 PM. I don't even dare to click on it for fear that it might be a virus or something else. Additionally, my PC has been lagging for streaming videos for the past 2 days (I have no idea if it's related, but I thought I'd mention it). I regularly use CCleaner and Malwarebytes and scan my PC with Avira antivirus (free version).
I would like to know what it is? Is there a risk to my PC?
I will run CCleaner, Malwarebytes, and Avira again, and continue browsing forums while waiting for a response.
Thank you in advance to everyone who takes an interest in this topic.

P.S.: I hope I posted in the right place; sorry for my first post on a forum. Usually, I resolve the problems I encounter by browsing existing topics, and I thank everyone; I can't count how many times they've helped me.

Configuration: Windows 7 / Firefox 15.0

2 answers

  1.
    FreeFour Posted messages 850 Status Member 189
     
    Hello,
    "DllRegisterServer in msdia80.dll succeeded."

    There is indeed something poorly adapted on the Microsoft page for us French speakers... anyway, I managed to get this positive message from Windows (positive... but I don't understand anything) and here's how I did it:

    1: I made visible in Windows 1:hidden files, 2:protected operating system files, and 3:known file type extensions:

    (open any folder), menu "Organize>Folder and Search Options>View tab> *the three settings are there.

    2: I created a folder named VC in C:\program files\common files\microsoft shared\.
    * Note: to get there, keep in mind that in a French Windows explorer, the folder "program files" is displayed as "Programmes" while in the terminal it is indeed "\program files\".

    3: I moved the cursed file (msdia80.dll) to the "VC" folder we just created by simple cut/paste.

    4: I opened the terminal in administrator mode:
    Start Menu>search: cmd>(right-click on the result "CMD.EXE") > Run as administrator.

    5: I executed regsvr32 directly in the "VC" folder where "msdia80.dll" is now located by navigating there like this: 

    c: [Enter]
    cd\ [Enter]
    cd program files [Enter]
    cd common files [Enter]
    cd microsoft shared [Enter]
    cd vc [Enter]
    regsvr32 msdia80.dll [Enter]

    *At that moment a window popped up with a white "i" icon on a blue pill and the message "DllRegisterServer in msdia80.dll succeeded."

    - I don't know what it did... or how... but I feel like it's okay (?) So it's not very elegant but I hope it's good!
    6
    1. Io
       
      Thank you Fabul for your instructions, and especially for the explanation to find the location of the VC in the common files, which is not indicated on the Microsoft site.
      As for the commands, it's great, it's educational. It not only provides the command but also the path, including all the steps and explanations of the instructions; we understand what we're doing and we learn. In short, perfect!! (I just came out of a long reinstallation of W7, your message was very welcome :)
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