First you have to be able to see the extensions in WIN9x. Change the setting in Windows Explorer so that all extensions are shown. Then find the cr2 that's named "YourFile.txt", right click on it so the context menu pops up, then choose "rename" and change the extension to "YourFile.cr2". You may get a warning that this will make the file unusable, just ignore it. All of this assuming you're using Windows ;-) -JH.