Won't compile on OpenMandriva ROME due to zlib conflict

**Describe the bug**
When building file.cpp on OpenMandriva you get the error:
```/usr/include/zlib.h:34:4: error: Include zlib-ng.h for zlib-ng API or zlib.h for zlib-compat API```
The fix is to move 
```
#ifndef WIN32
#include <zlib.h>
#endif
```
to the top of file.cpp




 - OS and Version: OpenMandriva ROME



