Java APIs on Windows consistently allow users to specify paths using
either regular slashes or backslashes.

Unfortunately, for the specific case of executable names, this fails.
For example,

Runtime.getRuntime().exec(new String[]{"C:/WINNT/System32/cmd.exe", "/C", "CD"})
fails with Windows Error=2 (file not found)

This is worse because the same Runtime.exec API has not problems when
the directory is being specified - that can use forward slashes.

###@###.### 2004-03-02