How to avoid compressing compressed files

How to avoid compressing compressed files Most compression programs compress all files by default. But when archiving a folder containing already compressed files, there is no need to compress them a second time, such as archives, packed setup program, jpg, movies, mp3,....
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Total answers/comments: 2

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bert [Entry]

WinRAR allows you to select files to store without compression, under the Files tab when you make a new archive. I don't believe it supports wildcarding, however - but the included Rar.exe cli tool should be easily scriptable to do this.

bert [Entry]

"Despite mp3 and jpg being compressed it's still possible (even likely) that their size will be reduced if you compress them with WinRAR/7Zip.

I tested on a collection of mp3s of various bitrates and they all went down in size."