I get huge temp files from horizons building up in a strange place, and they tend to get fragmented a lot too.
Here is an example:
1,787 330 MB \Documents and Settings\(user name here)\Local Settings\Temp\WER81e2.dir00\horizons.exe.hdmp
This is with windows XP, first number is the number of fragments it was in, second was size.
I delete them all without any noticeable effect on Horizons.
Why are these files created and not deleted? Any reason not to delete them?