Here's one to fix a problem that can cause Windows 95 and 98 to "blue screen" with a Fatal Exception Error message when you attempt to open a folder.

If a path to a file or folder contains an MS-DOS device name (i.e., PRN, NUL, CON, etc.), it is treated as invalid; however, where a path contains two or more MS-DOS device names, Windows does not treat it as invalid. Instead, it performs an illegal resource access operation, becomes unresponsive, and / or crashes. This error is usually encountered if you try to access a URL in a malicious e-mail or Web page since folders and filenames cannot be created with reserved MS-DOS device names.

The problem can be fixed with downloads of Ifsmgr.vxd for Windows 95 and Windows 98.

Windows 95
http://download.microsoft.com/download/win95/Update/6467/W95/EN-US/256015USA5.EXE

Windows 98 and 98SE
http://download.microsoft.com/download/win98SE/Update/6467/W98/EN-US/256015USA8.EXE

Download and run the appropriate file.