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Batch file programming - updating files.

I'm trying to produce a bootable disk which will detect the version of windows, either 3.11 or 3.1 and overwrite the winfile.exe with the MS year 2000 compliant one.  However how can I tell the version from within a batch file?  What commands can I use to determine which copy to copy across.  It needs to be done automatically because it needs sending around the country to my companies branches.  The users cannot be trusted to do it on their own.
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rwilson032697
Include on the disk a small 16 or 32 bit checksum program. Have the batch file or program on the bootable disk run the checksum program over the winfile.exe program and check the result against the known checksums for the 3.1 and 3.11 versions. Based on that copy the correct one over...

Cheers,

Raymond.
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mmanning

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R.Wilson could you please give me some more informatin on how to do this.
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mmanning

ASKER

Additional information needed on how to do it!  Thanks
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cbo120897
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rwilson032697
cho is on the right track, but his method won't distinguish between versions (I think).

Cheers,

Raymond.
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cbo120897
Hi rwilson,
I think different versions have different byte structure (and file size).
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mmanning

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Raymond I produced a bootable disk which works carries out the task well.  

Thankyou
MManning