According to RFC 1738, the plus, period, and hyphen characters are allowed in URL schemes.

Prefer the bin directory when getting the data dir location.

We will need this for d3d10, where both dxgi and d3d10core are making wined3d
calls. Right now d3d8/d3d9 also use this to protect their own data, but
eventually we should push this down into wined3d itself and use something a
bit more fine-grained. There's no good reason that doing e.g. a vertex buffer
upload in some thread should block all of wined3d.