: Ensure all parts have the exact same name except for the trailing numbers. 2. Extract the Content
: Choose 7-Zip > Extract to "native_plants_of_australia" . native_plants_of_australia.7z.001
: Double-click the .001 file; the software will automatically join the subsequent parts. How to Extract .7z.001 files - Microsoft Q&A : Ensure all parts have the exact same