Managing the AutoCAD Recent Documents List
Does your AutoCAD recent file list work for you, or does it fill up with seemingly random .DST (sheet set) files instead of the last .DWG files that you worked on? The latter is documented all over the Autodesk forums, here is one such thread, dated back to 2008 (yes, it has been an issue for that long). In another thread, Jeff Mishler from Quux Software has provided a standalone application (at no cost) to help you manage your recent documents list.
The AutoCAD Recent Documents List Manager allows you to select and remove items from this list easily. Below is a screen shot of this app.
Make sure all your AutoCAD based applications are closed and then launch the application. Now start by selecting the AutoCAD product, then the profiles associated with that product will be listed below. Select one and then the recent document list will be displayed in the center pane. A subset of that list, showing only the .DST files will be shown in the right pane. Select the items you want to delete and press the Remove Selected Items button. When you restart your product, you will see the results.