BulkZip compressed archive
File type: Archive and compressed file
Files with the bulk file extension are compressed archives created by BulkZip. A bulk file can contain compressed files and folders.
File type category:
Archive and compressed file
Date updated: October 7, 2026
The bulk file extension belongs to BulkZip, a data-compression tool for Microsoft Windows. BulkZip uses its own archive format for storing compressed data.
A bulk file stores files and folders in compressed form for archiving or transfer. The BULK format uses compression methods including LZMA2, PPMd and DEFLATE, with the aim of providing high compression ratios and fast operation.
Use BulkZip on Microsoft Windows to open a bulk file and extract its contents. The file is associated with the BulkZip compressed archive format.
There is no need to convert the compressed data itself when the goal is to use the files in another archive format. Open the bulk file with BulkZip, extract its contents, and repack the extracted files with another compression utility.
Software applications that can open bulk files:
Microsoft Windows
BulkZip
Software apps that create bulk files:
Microsoft Windows
BulkZip
Software apps that extract bulk files:
Microsoft Windows
BulkZip
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