Troubleshooting under Windows is slightly different from POSIX conform operating systems. The differences are handled here.
Error messages, Trace file
Changing the Exetype to See Console Output
All executables and DLLs on Windows operate in one of a few different subsystems, most of them either in Console or GUI (also called Windows). Basically, executables in Console always start up in a new console window and print output for stdout und stderr to it, whereas ones in GUI do not open windows and are pretty quiet, even in console windows. If you want to change that subsystem type, because you want to see debugging output or hide unnecessary console windows,  lists a few possible ways.
The easiest option if you don't have any further build tools available is probably the third one from that mail:
- Fetch https://github.com/Gnucash/gnucash-on-windows/blob/master/exetype.pl
- Install Perl, if not already done for Online Quotes and
- start cmd.exe type
exetype.pl gnucash-bin.exe console