[Issue 23454] New: DMD CLI bug when using -I

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23454

          Issue ID: 23454
           Summary: DMD CLI bug when using -I
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: msnmancini at hotmail.com

I remember having this bug for quite some time, but I discovered an interesting
issue.

`dmd app.d -I.` causes an `Error: unrecognized file extension `.
Same thing on `dmd app.d -I=.`.

This error occurs ONLY in Powershell.
The Command Prompt does not get this error.

I have a faint feeling that this error has already occurred with me ldc2.

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