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VB5 Runtime Error 50003

My VB5 app executes fine under Win95, under NT4 I get runtime error 50003. I cannot find any references to this error, what does it mean?

The VB5 setup wizard suggetes problems running my VB5 app under NT 4 unless is has service pack 2, why?

Thanks

PAJ
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What about using InstallShield for the installation. Should I just inform users that they must have SP2/3 to run? If so which additional system files should I include in the InstallShield distribution?

Thanks again.

PAJ
I haven't had very much experience with InstallShield, but I would guess that it's not quite as flexible as the VB5 setup wiz as far as customizing.  My suggestion would be to either include a note about SP2/3 in your release notes or maybe create a small customized setup program preferably with C.  All you would have to do is reaname the install shield program to setup2.exe or install.exe or something like that.  Then  create a very small C program that simply checks the operating system and informs the user to install SP2 or 3.  In this manner, you could avoid problems of a user trying to install without reading the release notes and causing you the additional headaches of service unneeded service calls.
See Microsoft's KB Article Q176438 about a bug :
"...Loading a GIF file that does not specifically contain an Image Object into Visual Basic (via the PictureBox control for example), generates the run- time error 50003...