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From: "Randy Brukardt" <randy@rrsoftware.com>
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References: 
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Subject: Re: How to detect OS type and version?
Date: Thu, 13 Oct 2005 19:27:47 -0500
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Date: 2005-10-13T19:27:47-05:00
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"Stefan Bellon" <bellon@bauhaus-tec.com> wrote in message
news:20051013225800.4e50bfa0@pscube.informatik.uni-stuttgart.de...
Bernd Specht wrote:

>>But as he doesn't know the os, he cannot read an environment variable.

Why not? Use Ada.Environment_Variables (Ada 200Y) or the
implementation-defined version that comes with your compiler. (Pretty much
every Ada compiler I know of has one.)

>> Personally I've never seen a Windows system on a different drive
>> (older versions of Windows required C: which often gave problems with
>> OS/2 on same drive). Beside this you can try C:, D: ...

>And I have never seen a Windows installed inside a directory called
>"winnt".

That was the standard for Windows NT and at least some Windows 2000 systems.
All of the systems here are that way. (OTOH, none of them are on drive C:)

As I said before, once you figure out that you are running on Windows (some
version), then dynamically load the GetVersionEx API function and get all of
the version details.

                            Randy.