Split multi-volume BulkZip compressed archive, part 4
File type: Archive and compressed file
The bulk-004 file extension identifies the fourth part of a split, multi-volume archive created by BulkZip for Microsoft Windows.
The file is not a complete archive by itself. All parts are required to extract the archived files.
File type category:
Archive and compressed file
Date updated: October 7, 2026
The bulk-004 file extension is associated with BulkZip, a data-compression tool for Microsoft Windows that uses its own BULK compression format.
A bulk-004 file stores the fourth volume of a compressed, multi-volume BULK archive. The format uses compression methods including LZMA2, PPMd and DEFLATE to provide high compression ratios and fast operation.
To unpack the archive, all split parts must be kept in the same directory. BulkZip reads the volumes together when extraction is started from the first volume.
A bulk-004 file is one part of a split BulkZip archive and cannot normally be extracted on its own. Place it in the same directory as all the other parts, then open the first volume in BulkZip on Microsoft Windows and start the extraction.
The bulk-004 file is not normally converted directly because it is only one volume of a multi-volume archive. Obtain all the parts, extract the archive with BulkZip, and repack the extracted files in another archive format if required.
Software applications that can open bulk-004 files:
Microsoft Windows
BulkZip
Software apps that create bulk-004 files:
Microsoft Windows
BulkZip
Software apps that extract bulk-004 files:
Microsoft Windows
BulkZip
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