Microsoft KB Archive/310880

= OLEXP: &quot;Msimn.exe Is Not a Valid Win32 Application&quot; Error Message When You Start Outlook Express 5 =

Article ID: 310880

Article Last Modified on 1/31/2007

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APPLIES TO


 * Microsoft Outlook Express 5.01 Service Pack 2
 * Microsoft Outlook Express 5.0

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This article was previously published under Q310880



For information about the differences between Microsoft Outlook and Microsoft Outlook Express e-mail clients, click the following article number to view the article in the Microsoft Knowledge Base:

257824 OL2000: Differences Between Outlook and Outlook Express



SYMPTOMS
When you try to start Outlook Express version 5, the program may not start, and you may receive the following error message:

C:\Program Files\Outlook Express\Msimn.exe is not a valid Win32 application



RESOLUTION
To resolve this issue, extract the Msimn.exe file from the Windows 98 CD-ROM or from the Windows .cab files on the hard disk, and copy the Msimn.exe file to the Outlook Express folder. Follow these steps:
 * 1) Make sure that the Windows 98 Second Edition CD is in the CD-ROM drive or that the Windows .cab files are available on the hard disk.
 * 2) Click Start, and then click Run.
 * 3) In the Open box, type sfc.exe, and then click OK to start the System File Checker utility.
 * 4) In the Select an option and click Start list, click Extract one file from installation disk, type msimn.exe in the box, and then click Start.
 * 5) In the Restore from box, type the path to the CD-ROM drive. For example, if your CD-ROM drive is drive D, type d:\win98, and then press ENTER.
 * 6) In the Save file in box, type C:\Program Files\Outlook Express, and then click OK.
 * 7) To back up the existing file before overwriting it, specify a location to save it to, and then click OK. To bypass backing up the file, click Skip.
 * 8) When a message tells you that the file has been successfully extracted, click OK.
 * 9) Quit the System File Checker.
 * 10) Try again to start Outlook Express.

Keywords: kberrmsg kbnofix kbprb KB310880

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