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So I've twice had a problem recently whereby map data saved to notepad has changed itself into bizarre symbols. Visual reference:

After a little probing around I discovered a solution to recover the original data, as follows:
1. Go to where the Notepad document is stored.
2. Right click the document and select properties.
3. Find where it says 'Open With: Notepad' and click on 'Change'.
4. Select Wordpad.
5. Open the document and it should automatically open in Wordpad with the correct data (or it might put the $blah#blah#blah# bit in the middle somewhere as it did with mine, in which case just copy and paste it to the beginning of the data and it should be fine).
6. Copy this data somewhere safe. Change your 'Open With' option back to Notepad.
7. Paste in the correct data.
8. Done! No more tearing your hair out over lost masterpieces!