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Batch change of file extensions - Windows 10

Anonymous
2019-10-01T08:33:17+00:00

I have recovered 900 photos, these now have the .chk file extension. I can change individual files to .jpg and then the image is fine. I now need to convert all 900 in one folder. Hopefully there is a method to run a 'batch' conversion. Grateful for any advice please.

Windows for home | Windows 10 | Files, folders, and storage

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  1. Martmcd 19,970 Reputation points Independent Advisor
    2019-10-01T09:22:50+00:00

    i have been reminded that command prompt is not available in the file menu of later builds of windows 10 (thanks anon)

    in explorer, navigate to the folder with the .JPG files

    click in the address bar and type cmd and press enter

    it should then open cmd prompt to the current folder (check the text before the >)

    please let me know if you have any problems

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  1. Martmcd 19,970 Reputation points Independent Advisor
    2019-10-01T08:46:10+00:00

    Hi RNC1000

    first make a backup of the files, just in case

    open file explorer and navigate to the folder containing the .chk files

    click File -> open command prompt -> open command prompt

    in the command prompt window

    look at the prompt to check that you are in the correct folder

    type the following then press enter

    ren *.chk *.jpg

    when it is finished, close the command prompt

    the .chk files should now be .jpg

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  2. Martmcd 19,970 Reputation points Independent Advisor
    2019-10-01T14:00:51+00:00

    You're welcome.

    sorry for the earlier misdirection.

    i am glad you got it sorted

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  3. Anonymous
    2019-12-24T15:26:22+00:00

    This is odd.  I am at the command prompt and in the directory where my files reside.  I want to change .dat files to .jpg files.   I tried the "ren *.dat *.jpg" command. I believe this follows your guidance.  It also appears to be as MS recommends, but I get a "The system cannot find the file specified".  I have tried "*.*" instead of "*.dat" and get "The syntax of the command is incorrect".   Apparently I am missing something.  Can you help?  Thank you.

    Hi Aviator001,

    I used the instructions Martmcd posted and they worked. The only part I found tricky was to get the cmd prompt to appear with the correct directory address. Once I was in file explorer with the correct folder showing in the address, I had to repeatedly click in the address bar to get the path highlighted blue, then typed cmd to completely replace that text, then the cmd prompt opened with the correct directory address showing and then >ren *.chk *.jpg worked just fine for me. Good luck.

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  4. Anonymous
    2019-12-21T22:11:43+00:00

    This is odd.  I am at the command prompt and in the directory where my files reside.  I want to change .dat files to .jpg files.   I tried the "ren *.dat *.jpg" command. I believe this follows your guidance.  It also appears to be as MS recommends, but I get a "The system cannot find the file specified".  I have tried "*.*" instead of "*.dat" and get "The syntax of the command is incorrect".   Apparently I am missing something.  Can you help?  Thank you.

    4 people found this answer helpful.
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