Revision 1809921

Add some additional checks required on Windows to keep all the checks in one place and to avoid exceptions later in the processing.
Includes utility class to determine if platform is Windows and performance test case for alternative implementations.

Includes updates after kkolinko review
- Correct comment
- Use correct regular expression match (that makes regular expressions an even worse option)
- Improve (roughly x2) performance of invalid filename check
This is the fix for CVE-2017-12617