EXPAND - from msconfig
Description and Explanation of a Cabinet File
Cabinet files are compressed packages that contain a number of related
files. The format of a cabinet file is optimized for maximum compression.
Cabinet files on the Windows XP compact disc (CD) contains the actual
Windows files.
You can extract individual files from the cabinet files to replace missing
or corrupted files. To extract information from a .cab file in Windows XP:
1. Click Start, and then click Run.
2. In the Open box, type msconfig, and then click OK.
3. Click Expand File.
4. In the File to restore box, type the name of the file that you want to
restore.
5. In the Restore from box, type the path to the Windows XP .cab file from
which you want to restore the file, or click Browse From to locate the
Windows XP .cab file.
NOTE: The Windows XP .cab files are stored in the I386 folder on the Windows
XP compact disc (CD).
6. In the Save file in box, type the path to which you want the new file
extracted, or click Browse To locate the folder that you want.
7. Click Expand.
8. In the System Configuration Utility dialog box, click OK. If you are
prompted to restart the computer, click Restart.
Example: expand d:\i386\acces.cp_ c:\Windows\system32\access.cpl
In you case expand d:\i386\rundll32.ex_ C:\Windows\system32\rundll32.exe
Hope this assists