Related Clues:
- File extension for PC programs
- Image file type
- English river sounds like a letter
- UU, perhaps, before this for the start of 16 down
- Application filename extension
- Program file ending
- PC file extension
- PC program extension
- Computer application file extension
- River that's unknown, we're told
- River of SW England
- Spot to locate treasure in middle of deep river
- River flowing from Exmoor to Exmouth via Exeter
- Current wife finally meets previous one
- River at Exeter