There could be several reasons why the project file got corrupted. Here are some of them:
1. The connection with the disc on which the project file is stored was lost
2. Some other software (such as antivirus or file cleaner) was working with the file during the saving process
3. The software was closed during the saving process.

Please describe what exactly you were trying to do when the program crashed to our support: https://smartshow-software.com/support.php
They'll help you find out what could have damaged the file.

Also, send them the file so they could check if it could be restored.

My software crashed and i can not open my last save project.
its written "failed to open project file,it may be corrupted or have a wrong format"

Thanks