What is this 3GB file? MSSDMC?


  1. tmkeller
    Posts : 4
    Windows 7 Ultimate 32 and 64 bit
       New #1

    What is this 3GB file? MSSDMC?


    There's this huge 3GB file in C:\Users\myusername\AppData\Local\Temp\MSSDMC
    that has a long encoded name that I can't figure out what it is.

    I f'ing Googled MSSDMC and there were 0 results. Zero. WTF?

    Anyone got any info on this? I'm deleting it and seeing if it comes back.
    Attached Thumbnails Attached Thumbnails What is this 3GB file? MSSDMC?-mssdmc.jpg  
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  3. Jonathan_King
    Posts : 13,354
    Windows 7 Professional x64
       New #2

    Hello,

    I wonder if that is a virus. It is suspiciously close to the file MSSDMN.

    While that is not necessarily correct, running a virus scan is never a bad idea.

    I recommend Malwarebytes if you suspect your computer is infected.
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  4. jfar
    Posts : 5,840
    Vista Ult64, Win7600
       New #3

    Delete it, it is in the Temp folder.
      My Computer
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  6. tmkeller
    Posts : 4
    Windows 7 Ultimate 32 and 64 bit
    Thread Starter
       New #4

    @Johnathan_King - I don't suspect a virus, my system has had AV scans daily since it's inception. Also confirmed by scanning the files directly.

    @jfar - probably what I'll do.

    Interestingly I did a google search on the file name (hash) and it came back as a SHA256 for the ISO of Windows 7 on some French blog. Crazy! 63C02E9F0B91061203CA67D71456EA0F8A8C5C90134439C707DE32090251391E - Google Search=

    I'm thinking it's like a temporary file for Windows setup? I was just curious if anyone else had this file in their temp directory.
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  7. Dom
    Posts : 2,295
    Windows Seven Ultimate
       New #5

    After you deleted it manually, run disk cleanup (type in start menu search) to remove any other temp files.
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