Here is a bug in Leopard that made me loose some important files. I tested this in different Macs: I had many text files in the .rtf and the .rtfd format. They were sorted by type inside a folder and I wanted to group them together. To group these text files together, I manually changed the .rtf extensions to .rtfd. Then, I opened these files using TextEdit and dragged an image inside each of the .rtfd text files. and tried to Save only (not with a new name). Here is a step by step: 1- Open TextEdit and save a .rtf file 2- Manually change the extension to .rtfd 3- Open the .rtfd file and drag an image inside the text. 4- Try saving it. TextEdit will ask if you want to just Save it or Save with a new name. Click "Save" only. 5- Voila!!! Your file vanished forever !!!!