The win87em.dll error usually occurs in Concept when online animating a function block.

"Application error
Concept cause a General Protection Fault in module WIN87EM.DLL at 0001:02C9.  Choose close.
CONCEPT will close."

This error can be corrected by doing the following:

1/  Copy hide87.com file into the windows\system32 folder.

2/  Open c:\windows\system32\autoexec.nt with Notepad

Create the autoexec.nt file if it does not exist.

3/  Insert the following at the top of the file:

lh %SystemRoot%\system32\HIDE87.com

4  Save changes to autoexec.nt and reboot the PC.

(The Windows 80×87 emulator library, WIN87EM.DLL, works at the 16-bit-Windows level to virtualize the coprocessor among multiple
Windows-based applications that run inside the system VM.)  HIDE87 is supposed to hide the math coprocessor from the kernel.)

For this reason, if you encounter this when running Concept, you may want to install Concept on a VM where hiding the math coprocessor might not
have the same impact it would have on the host OS.

Released for: Schneider Electric Singapore