Hi. Though I still don't believe it is possible for Site Turbo to change original files as you've claimed, I've added a destination checker to Site Turbo. Site Turbo now does this when you drag a file or folder onto its main window:

1. Scans through the folder, compiling a list of files.
2. Copies each file, hierarchically, to the Site Turbo Output folder (on the Desktop).
3. Scans through each copied file, verifying that its full file path includes the folder "Site Turbo Output". This means that Site Turbo will be entirely unable to edit a file that is not in the Site Turbo Output folder, regardless of the current situation.
4. Optimizes the file.

Site Turbo was reposted with this change at 12:50 PM EST. Version is still 1.0.