This can happen in Win7, Win 8 and 8.1 as well, but very rarely on XP SP3.
After unpacking the GJTracker software and copying unzipped folder into root directory clicking .exe file caused Windows to splash an error warning :
"Class not registered. MSSTDFDMT.dll is missing or corrupt."
This is caused by wrong registry setting or accidental unregistering the library from System.
Another (probable) cause is than some version of Windows do not use this .dll which is actually connected with Visual Basic libraries and partially Outlook Express/Office.
Below is a simple solution, choose 32 or 64 bit version depending on OS You're running.
1. Try to find MSSTDFDMT.dll in Your system - check if it's already there - if YES - should be located in C:/WINDOWS/System32 for 32 bit version, or C:/WINDOWS/sysWOW64 for 64bit OS.
If it's missing - You need to download it from net, or copy it from another PC and simply paste downloaded file into the folder (depending on which version of OS You're running)
Last step is registering the .dll file in Windows registry using regsvr32 command.
32bit OS: click Start, Run - type cmd in the dialog box and run it.
After old good DOS window appear You should see something like c:/windows/system32
and press Enter. You will see OS note that registering the file is successfull.
64bit OS: same as above, but using Win8.1 or Win10 to get Command Prompt with Administrator prvileges we need to click the "Windows", type "cmd" directly to "Run" box and choose "Run as administrator".
After confirming we want to use Administrator rights type in Command prompt as below:
OS will confirm the file was registered successfully.
Now You can run GJtracker again and all should be fine.