Windows Compression lossless or not???

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Disk Cleanup keeps "recommending" that I can save space by compressing
my old files. A significant portion of my files are audio and video
files that I have not yet had the chance to burn to disc. What method
of compression does Windows use? Is it lossless? If not, I suspect
that it could severely damage my files. What kind of recommendation is
that?! I certainly wouldn't trust it to compress my files. Please
advise. Thank you.

.



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