Windows 7: mysterious behavior using gVim to change file in c:\program files

Here is my weird experience. I want to modify fzdefaults.xml, a
FileZilla config file located in the Windows 7 directory C:\Program
Files\FileZilla FTP Client. Here's what happened.

1. In Windows Explorer select fzdefaults.xml
2. right-click, in the context menu select "Edit with Vim"
3. change the file.
4. write it out (:wq) exiting Vim
5. repeat steps 1-4 to verify the change is in the file. gVim shows
the change
6. run FileZilla
7. The configuration change does not work!
8. Repeat steps 1-4 to verify change is in the file. gVim shows the
change
9. Examine file with Notepad. The change is not there.

gVim is showing me the wrong contents of the file -- not what is on
the disk.

Once I realized what was going on, I was able to change the file by
starting gVim using "Run as administrator". This time it worked, but
this situation really faked me out.

Why is gVim showing me the wrong contents of the file? That is a bug,
right?

-Sam

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