Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The LUZ file type is primarily associated with 'Spectramap' by Coloritto.
The LUZ file extension is the CUDA data visualisation file for Spectramap, a menu-driven data analysis and interpretation tool.
Spectramap renders visual displays of row and column relationship within a table spreadsheet making contrasts, ratios or differences possibly clearer than other formats.