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WinRAR: A popular alternative that handles many compression formats.

Keka (for Mac) : A reliable choice for macOS users dealing with split files. Download 001 zip

Check that the filenames are identical except for the numbered extensions. WinRAR: A popular alternative that handles many compression

7-Zip (Free/Open Source): Widely recommended for split archives. Download 001 zip

Since Windows File Explorer often fails to recognize split archives, download and install one of the following reputable tools: