: The official 7-Zip is the standard tool for this format.

: ZArchiver is a highly-rated mobile option for 7z files. 3. Extract from the First Volume

Do you have all the other ( .001 , .002 , etc.) in that same folder yet?

The file extension .003 (specifically part of a HAY.7z.001 , HAY.7z.002 , HAY.7z.003 sequence) indicates that you have the third part of a .

in the sequence (the one ending in .001 ). Right-click HAY.7z.001 . Select 7-Zip > Extract Here (or your app's equivalent).

To access the "good content" inside, you cannot open this file by itself. You must follow these steps: 1. Gather All Parts

You need all numbered segments of the archive (e.g., HAY.7z.001 , HAY.7z.002 , and HAY.7z.003 ) saved in the . If any part is missing, the extraction will fail because the data is spread across these volumes. 2. Use a Compatible Extraction Tool

The software will automatically detect and pull data from .002 , .003 , and so on to reconstruct the original "content" into a single usable file or folder.