MRC file extension is for Bibliographic data Machine-Readable Cataloging records
Similar to MRC
### - DoubleSpace Compressed volume file### - QTIC Temp file
#24 - LocoScript Printer data file for 24 pin matrix printer
#GF - MetaFont Font file
#IB - LocoScript Printer data file
#SC - LocoScript Printer data file
#ST - LocoScript Standard mode printer definition file
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