All about BLOCKMAP Files

The BLOCKMAP file type is primarily associated with Windows Store.

BLOCKMAP	File extension: BLOCKMAP
	File type:	metadata file

What is a BLOCKMAP file?

BLOCKMAP files mostly belong to Windows Store. An BLOCKMAP file is a metadata file that maps file blocks to verify file integrity. It uses one of two internal formats.

CAP Format: This format is used as a Windows app manifest. It holds file locations and block hashes for apps distributed via the Windows Store. It works with Msixmgr.exe and is supported by the Windows Store.

GZIP Format: This format stores file checksum data and metadata for sparse files. It is used during installations, for example by applications built with Inno Setup.

FilExt.com tip: To view a BLOCKMAP file, open it with a text editor if it is in plain text format or use a decompression tool if it is GZIP-compressed. Do not modify the file because it is integral to managing file updates through block-level verification.

How to open a BLOCKMAP file

You need a suitable software like Windows Store to open a BLOCKMAP file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your BLOCKMAP file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a BLOCKMAP file directly in the browser:. Just drag the file onto this browser window and drop it.

Online BLOCKMAP Text Viewer

Choose your .blockmap file to analyze

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Online File Viewer

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Programs that open and convert BLOCKMAP files:

Windows Store
See the previous paragraphs to learn more about the main application. BLOCKMAP files are often referred to as Windows Store data files because this type of file is primarily created or used by this software.
Windows Store, Inno Setup
A BLOCKMAP file is a metadata file used by various software applications, primarily for package management and software distribution. It typically contains information about the internal structure and integrity of a software package or installation file. One common use of BLOCKMAP files is in the context of Windows application packages (.appx or .msix). In this case, the BLOCKMAP file, often using the CAP format, stores a manifest describing the application's contents, including file locations and cryptographic hashes for each block of data within the package. This information is used for verifying the integrity of the package and enabling efficient differential updates. Another use of BLOCKMAP files is within software installers, such as those created by Inno Setup. These BLOCKMAP files, often compressed using GZIP, contain metadata related to the installer's file structure, including checksums and information about sparse files. This data is used for verifying the integrity of the installer and optimizing the installation process. This file format is classified as Metadata File.

Technical Data for BLOCKMAP File Extension

File classification:

Data

a blockmap metadata file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with BLOCKMAP files

Associate the BLOCKMAP file extension with the correct application.
Update your software that should actually open metadata files. Because only the current version supports the latest BLOCKMAP file format. Search, therefore, e.g. on the manufacturer website after an available Windows Store update.
To make sure that your BLOCKMAP file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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