While Q_OS_WINRT does define the FORMAT_MESSAGE_IGNORE_INSERTS flag, the non WinRT WIN32 pathway does not.

This is needed to provide better error detail in regard to error messages. Without the flag, a lot of system errors are not returned.

Within any design change to this API, please consider the fact FORMAT_MESSAGE_IGNORE_INSERTS means parameter format specifiers will be returned within any error code.

At the moment, what would be returned from the Q_OS_WINRT and !Q_OS_WINRT are different due to one using this flag and one not.

I prefer more detail on such an error rather than less, so vote for adding FORMAT_MESSAGE_IGNORE_INSERTS rather than removing it from Q_OS_WINRT.