| 81. | .xv | ADM output waveform ◊ Bitmap graphics (Khoros Visualization Image File Format) |
| 82. | .xwd | X Window system window dump file (color bitmap graphics) |
| 83. | .xwf | Works file (Yamaha XG) (MIDI sequencing) |
| 84. | .xwk | Keyboard mapping (Crosstalk) |
| 85. | .xwp | Session (Crosstalk) ◊ Text document (Xerox Writer) |
| 86. | .xx | Encoded file archive (ascii) (xxdecode - xxencode) |
| 87. | .xxe | Encoded file archive (ascii) (xxencode) |
| 88. | .xy | Text document (XY Write) |
| 89. | .xy3 | Text document (XYWrite III) |
| 90. | .xy4 | Text document (XYWrite IV) |
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