- _WIN32_WINNT had wrong value to do workaround on Vista+ RegGetValueW.
- Do #undef and #define _WIN32_WINNT _WIN32_WINNT_VISTA in assoc.c.
- Delete _WIN32_WINNT hack in CMakeLists.txt.
CORE-9283
When no extension is provided, add default extension with correct precedence using PathFileExistsDefExtW.
- Use PathFindOnPathExW when searching in current directory and PATH environment variable.
- Fix Width String terminator to UNICODE_NULL.
- Fix all failed tests on PathFindPathExW KVM test.
CORE-17612
Suppose dwFlags == 1 | 4 (i.e. skipping the flag 2).
Then the while-loop would only run once, because at the second iteration
(after dwWhich >>= 1; has been executed once), dwWhich value == 2, but
dwWhich & 0x1 == 0, which makes the while-loop condition false.
Instead the loop should run, but the handling of the extension should be
skipped.
