Nope, the actual file names are fine 
The resolving of the includes in c++ causes this issue.
Something like this
#include "detailtextdlg.h "
Will be resolved to a path with trailing whitespaces, which causes the error in WindowsPathParser.
The Issue is solved by executing regex search and replace of all include statements that contained a trailing space, for example, #include "detailtextdlg.h " to #include "detailtextdlg.h"
i.e: our builds are green again