Opening a BLO File

The BLO file type is primarily associated with Microsoft Outlook.

BLO	File extension: BLO
	File type:	Offline Folder File

What is a BLO file?

BLO files mostly belong to Microsoft Outlook. A .BLO file is a data file created by Microsoft Outlook. It is used as an offline folder file, allowing users to access their Outlook data (such as emails, contacts, and calendar entries) even when they are not connected to a network or the internet. The file format is a binary large object (BLOB), which is a collection of binary data stored as a single entity in a database management system. In the context of Outlook, the .BLO file stores the data for offline use.

How to open BLO files

You need a suitable software like Microsoft Outlook to open a BLO file. You need a suitable software like Microsoft Outlook to open a BLO 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 BLO file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a BLO file directly in the browser:. Just drag the file onto this browser window and drop it.

Online BLO Text Viewer

Choose your .blo file to analyze

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Online File Viewer

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4 Steps to Open an Unknown .BLO File

Because .BLO files can originate from various programs, they are not universally openable.

Identify the Source: If received from an email archive, it is likely a Microsoft Outlook Offline Folder Data File. If downloaded from a retro gaming site, it may be a Blood II game file.
Check the Header: Inspect the first bytes in a text or hex editor.
- Readable XML/JSON suggests a configuration file.
- "PK" indicates a standard ZIP archive.
- Specific magic bytes may identify proprietary Microsoft data.
Use the Original Software: You usually need the original program, like Microsoft Outlook or a game engine; if uncertain, ask the sender.
Use this Webpage: Drag and drop the file into our viewer to detect the format, extract metadata, and preview contents when possible.

Technical Data for BLO File Extension

File classification:

Data File

Related files:

fix, blob, oft, olm, srs

a blo Offline Folder File is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with BLO files

Associate the BLO file extension with the correct application.
Update your software that should actually open offline folder files. Because only the current version supports the latest BLO file format. Search, therefore, e.g. on the manufacturer website after an available Microsoft Outlook update.
To make sure that your BLO file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .BLO file online - secure, fast, and no downloads needed.