Hi guys for those who got problem when running GDMO / Global Digimon Master Online especially the urlmon.dll error i ve found a fix for it.First you guys need to locate the GDMO Launcher program. In my Case, i put the GDMO program in C://ProgramFiles(x86)/Joymax/DMO. Now right click the Launcher and click the Troubleshoot Compatibility . After that, a window will pop up. You should click the Troubleshoot Programs. Then you must pick the "The program worked in earlier version of windows". Then, A window will pop up asking you to pick one of the Compatible OS. I personally choose the Windows 8, Why? Because, I already tested it with Windows 8. Now click next and click the "Test The Program" then click next. You should be able to play without any errors now.
(Step By Step with Pictures)