Native_plants_of_australia.7z.001

This filename indicates you have the . To access the data inside—likely a database or collection of ebooks regarding Australian flora—you must combine it with its matching parts. 1. Gather All Parts

: Double-click the .001 file; the software will automatically join the subsequent parts. How to Extract .7z.001 files - Microsoft Q&A

: Look for files named native_plants_of_australia.7z.002 , .003 , and so on in the same location where you downloaded the first part.