I am experiencing this as well. A recent upgrade to using Launch4j 3.50 is causing the program to fail to launch on some windows systems. adding the debug logging fails to produce output:

Faulting application name: launcher.exe, version: 8.1.33.0, time stamp: 0x65319598
Faulting module name: msvcrt.dll, version: 7.0.19041.3636, time stamp: 0x7e27562f
Exception code: 0xc0000409
Fault offset: 0x00086870
Faulting process id: 0x3700
Faulting application start time: 0x01da32b4ce513764
Faulting application path: C:\Users\jkramer\AppData\Roaming\My App\launcher.exe
Faulting module path: C:\WINDOWS\System32\msvcrt.dll

Systems we have encountered this on. (All are 64-bit x86 machines)
OS Name: Microsoft Windows 10 Enterprise
OS Version: 10.0.19045 N/A Build 19045

OS Name: Microsoft Windows Server 2016 Standard
OS Version: 10.0.14393 N/A Build 14393

msvcrt.dll version is 7.0.19041.3636