What is a mf file and how do I open a mf file?
An MF file contains information about file packages in a Java archive, and includes metadata about the archive such as what files it contains and what they are used for. Manifest files have the default pathname META-INF/MANIFEST.MF and are saved along with the JAR file. The default manifest file can be modified with a basic text editor.
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How to open mf file on Wikipedia
How to open mf file on Microsoft.com