Skip to main content
1-Visitor
September 18, 2025
Solved

Issue converting Mathcad 15 to Prime

Hi,

I am looking at converting a large number of legacy mathcad files to mcdx files. When I try to run the converter, it fails pretty much immediately, with an error: System.Runtime.InteropServices.COMException (0x80040CB6): Unknown Error at mcautomation.IMathcadWorksheets.Open(String pFileName) at ConverterLoader.Xmc...

Please can you advise what the issue might be here?

Thanks
James
VladimirNAnswer
24-Ruby IV
September 19, 2025

3 replies

18-Opal
September 18, 2025

Does it convert any file or just the "large number" of files.  If it doesn't convert any files then reinstall Prime and the converter. If it is specific files then look at functions in the file that may not be converting.

Translate
VladimirN24-Ruby IVAnswer
24-Ruby IV
September 19, 2025

Same issue - "Errors during conversion xmcd files to Prime": https://community.ptc.com/t5/Mathcad-Installation/Errors-during-conversion-xmcd-files-to-Prime/td-p/758507 

Translate
15-Moonstone
February 5, 2026

Hi @JD_14152912,

Did you try reinstalling the Mathcad Prime? What version of the Prime are you using?
Also, if you can repair your .NET framework. 
Regards, 

Dhiraj

Translate