Notes about the SEP file extension:
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 SEP file type is primarily associated with 'ChemSep' by ChemSep. ChemSep is a software system for simulation of distillation, absorption, and extraction operations. This is an input file to ChemSep.