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Batch File to delete files not equal to

I need to create a small batch file to clean up a directory nightly.
I want to delete all files that are not *.DAT
what is the Syntax for not equal to ?

cam
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JDCam
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JDCam
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NVITCommented:
This works. Make a .bat file of this code. Open a CMD window in the folder. It is currently in test mode for debug reasons so you can see what would happen. To run it for real, remove the ECHO word:
for %%f in (*) do if /i not %%~xf==.dat ECHO del "%%f"

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If you want to include subfolders:
for /r %%f in (*) do if /i not %%~xf==.dat ECHO del "%%f"

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NVITCommented:
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