Can Excel 32 bit instantiate ScriptMuuli 64 bit or PTV Visum 64 bit?

For PTV Visum yes, because PTV Visum runs as a 'out of process' COM server (*.exe), Excel VBA can instantiate both 32 bit and 64 bit Visum.
This is different for the component ScriptMuuli, as this is an 'in-process' COM-server (*.dll): Excel 32 bit CAN ONLY instantiate ScriptMuuli 32 bit and CANNOT instantiate ScriptMuuli 64 bit.
Workarounds:
- Use Excel 64 bit to instantiate ScriptMuuli 64 bit (available with Microsoft Office 2010).
- Visum 16/17: Register ScriptMuuli 32 bit.
c:\Program Files\PTV Vision\PTV Visum 17\ScriptMuuli\Win32\ScriptMuuli.dll
https://www.ptvgroup.com/en/solutions/products/ptv-visum/knowledge-base/faq/visfaq/show/VIS15643/
- Until Visum 16: install Visum 32 bit addditionally to be able to use ScriptMuuli 32 bit.

How to find out whether Excel is 32 or 64 bit?
File -> Account -> About Excel -> (in the first line of the dialog)