The content files in your new PLR packs are zipped. That means they are compressed. Compressing files creates a smaller "zipped" file. This makes downloading simpler. Most PC Windows versions can extract these files simply by right-clicking and choose "extract." This unzips all the files into a working folder. You can then access the individual files.
You can also download a free zipping/unzipping tool for Windows PCs here:
The have links to other solutions for different operating systems such as MAC here:
BQ PLR Support