Notes about the ALT 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 ALT file type is primarily associated with 'Aladdin Interactive DSP' by Hitech Development AB. Aladdin message list for building signal processing model. This file type is created with Aladdin Interactive DSP Workbench for use in user applications based on Aladdin Executive DSP program and DSPgate driver.