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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
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LMR - Extension Details
Date Added: January 01, 1970
File Extension:  .LMR
Description 1: .LMR file extension is linked with QuickBooks Loan Manager Data File. This is the file extension for the loan manager data file utilized by QuickBooks an accounting software which makes accounting tasks easy with the availability of finance organizing tools in a single program. .LMR file extension and QuickBooks are owned and developed by Intuit Inc.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: QuickBooks
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Extension: