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What is the purpose of blockmap file?

See original GitHub issue

Version: 20.10.0

Target: NSIS

I recently switched to NSIS based installer for my electron application. It works great! When I build the installer, one of the artifacts created is a blockmap file (MyApplicationName.exe.blockmap). I am curious to know the purpose served by this file. I would appreciate if someone can explain this. I searched for nsis blockmap but couldn’t find anything that would explain this.

Issue Analytics

State:
Created 5 years ago
Reactions:40
Comments:10 (2 by maintainers)

Top GitHub Comments

52reactions

gknappcommented, May 2, 2018

A quick web search:

The package block map file is an XML document that contains a list of the app’s files along with indexes and cryptographic hashes for each block of data that is stored in the package.

Taken from App Package Blockmap for Universal Windows Platform (UWP) Apps

If you use automatic updates, I believe the blockmap file is used for partial / differential updates to your application, to shrink the update payload size.

24reactions

develarcommented, May 2, 2018

This file is used for delta updates (#2217).