The generated files are mysteriously deleted

I developed an application that, after running on a Windows computer, generates some files. The files are saved to an internal shared server running Windows Server 2012. However, occasionally, some files are mysteriously deleted after the program runs. Not all generated files are deleted. I initially thought they were being deleted as viruses, but disabling security protection on the Windows server did not help.

Could you please help me explore the possible causes and solutions？