I am currently working with a lot of old scanned photos. But when I look at them in Bridge many of them have this little icon in the top right hand corner:
When I click on them to open Photoshop they open in some Camera Raw 7.1 window. These files often don't have desktop thumbnails (I'm on a Mac). I don't want to open them in Camera Raw. They are just TIFF files.
What Curt is implying is this:
Adobe Camera Raw can open TIFF files as well as raw files. Once you open a TIFF in Camera Raw and perform any adjustment or correction, it will acquire that icon of a circle with two sliders, and from then on it will only open in Camera Raw.
To get rid of that adjustment and its icon, go to the Edit menu in Bridge > Develop Settings… > Clear Settings.
From then on that particular file should open straight into Photoshop as a regular TIFF file.
Check your preferences, so that you don't have JPEGs and TIFFs to automatically open in Adobe Camera Raw.
If you had indicated what versions of everything you're running, I'd have included a screen shot for you.