Nikon published a notice about the software products that will be supported in Windows 8.1:
- ViewNX 2
- Capture NX 2
- Camera Control Pro 2
- Short Movie Creator
- Nikon Message Center 2
- Wireless Transmitter Utility (WT-4 Setup Utility)
- Thumbnail Selector
- NEF codec
- NRW codec
- IPTC Preset Manager
- GP-N100 Utility
The following products will not be supported:
- Capture NX Ver. 1.x
- Camera Control Pro Ver. 1.x
- Nikon Capture series
- ViewNX Ver. 1.x
- Nikon Transfer Ver. 1.x
- PictureProject
- Nikon View series
- Nikon Scan series
- PictureProject COOLPIX Remote Control
- WT-3 Setup Utility
- Wireless Camera Setup Utility
- Wireless Connecting Utility
- Nik Color Efex Pro 2.0
- my Picturetown Utility
- USB driver for GP-1
- Image Authentication Software
- PC-PJ Transfer
- Uplink Software
- Nik Color Efex Pro 3.0 Complete Edition
- Nik Color Efex Pro 3.0 Select Edition
For a list of Nikon software supported in Windows 8 see this post.