Minor file system corruption with Steam

I noticed some minor file system corruption with Steam. In order to replicate it, do the following:

1. Install Steam.
2. Go to \Program Files\Steam.
3. Delete all files except Steam.exe and keep the explorer window open.
4. Run Steam.exe.
5. Look at the names of the .writable, etc. files.

EDIT: I have attached a screenshot that shows the corruption.