Background

While trying to open AECOsim Building Designer, the program is failing with the below shown error.

Steps to Accomplish

This problem is caused by a missing or incorrect Microsoft windows registry entry for the Dynamic link Library Fm20.dll. The proper registration of this file is required when you work with UserForms.

To resolve this problem, register Fm20.dll. You must have Regsvr32.exe to register Fm20.dll. If you don not have Regsvr32.exe you can download the file. For additional information, please see the following article in the Microsoft Knowledge Base:
161983 Regsv32a.exe Available in Download Center

To register Fm20.dll, kindly follow these steps:

• Use Microsoft Windows Explorer to locate the Fm20.dll file in the Windows\System folder or in the Winnt\system32 folder (under Microsoft Windows NT).
  If the file is not present, you can copy it from the OS\System folder on the Microsoft Office 97 compact disc to the appropriate location.
• Close all open programs.
• Click Start on the Windows taskbar, click Run, and then type the following: Regsvr32.exe fm20.dll
• Click OK. the following message should appear: DllRegister Server in c:\windows\system\fm20.dll succeeded.

The file Fm20.dll should be registered correctly. then you will see that you wont get the error message again.