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.LG1 File Extension

A .LG1 file is a Message Queuing Message State File, created by Microsoft.

Open with Microsoft Message Queuing (Included with OS). Available for Windows.

What is a .LG1 file?

A .LG1 file is a type of log file used by Microsoft Message Queuing (MSMQ), which is a system built into Windows that allows different applications to send messages to each other even if they are not running at the same time. These messages are sent asynchronously, meaning they don't need immediate responses and can wait in a queue.

The .LG1 file specifically stores information about the state of message logs, which are recorded in .MQ files. These .MQ files contain all the messages that are being exchanged and managed by MSMQ. The .LG1 file helps keep track of what is happening with these .MQ files, especially while they are actively being written to. This is important because if something goes wrong during the writing process, like if the system crashes or the .MQ file gets corrupted, the .LG1 file has a record of the messages up to that point.

Alongside .LG1 files, you might also find .LG2 files. Both types of files work together to ensure that there is a backup of the message information, which helps in recovering any lost data if the main .MQ file encounters problems.

To open a .LG1 file, you would typically use Microsoft Message Queuing, which is included with the Windows operating system. This tool is primarily used by developers or IT professionals who are managing systems that rely on MSMQ for message communication.

MSMQ is particularly useful in scenarios where applications on different servers need to communicate, such as in eCommerce systems where orders and transactions involve multiple applications and services that might not be online at the same time. The queuing system ensures that messages are held until they can be successfully received and processed by the intended application.

In summary, .LG1 files are part of a system that helps manage and safeguard message communication between applications in Windows, ensuring that messages are not lost even in cases of technical issues. These files are usually found in the MSMQ\​Storage folder where the MSMQ service stores all its related files.

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