The LMC data file relates to Mentor Graphics Library Manager. It stores central library data. The file extension associates with software to manage libraries. Though this file type now is obsolete. Programs can open and view over 400 formats with File Viewer Plus. To import an LMC file into IBM Mobility Client, browse for it. The file contains data. Clicking connections in the Client allows access to tools. Tools enable import of configurations. What does the .LMC file extension specify? It tells your device which app opens a file. However, programs use .LMC files differently. Some open music compositions and others store Lingo Media Containers. Double-clicking usually opens a file. If Windows doesn’t recognize the extension, it can’t open the file. Then you must select an app able to open .LMC files.