Comment 19 for bug 1616844

> I rename wmf_free to uwmf_free in trunk r15724. Seems to fix problem.

Still takes a lot of time and memory to load the preview on Windows (is this the same on Linux?).

I think we have two independent issues here:

1. Crashing issue on *nix, which was probably caused by the name conflict. On Windows however there is no libwmf, so there was also no name conflict.
2. Extremely poor performance generating the preview (exclusive to Windows?)