Notes about the SLT 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 SLT file type is primarily associated with 'FinSafe Terminal Smartlet'. Small secure program that runs in a terminal - also see .SLX. A smartlet is usually in a .SLT file. A smartlet is a small program that runs inside the secure environment of a Finsafe terminal.