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Subject:	Re: too many environment variables on self-compiled xar archiver
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Am 24.05.2017 um 12:01 schrieb Andrey Repin:

>> Did you notice this entry and does anyone know where this comes from?
>>          !C:=C:\cygwin\bin

> This is coming from CMD, and denotes current working directory on an indicated
> drive.

And for (most of) all the hairy details, see

https://blogs.msdn.microsoft.com/oldnewthing/20100506-00/?p=14133

If you see these, you must have printed the environment using a tool 
other than CMD itself (e.g. Cygwin's "env").

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