Description:
I am attempting to write a steam table add in (bulk of this already written in C).

Available tutorials use idlc and regmerge.

Using unoidl-write and the available documentation generated a binary file which overwrote the input file (couldn't work out how to specify the output name).  This output file was unreadable by 

Steps to Reproduce:
C:\Users\martin\source\repos\libre_office_try\libre_office_try>cppumaker -C -Tcom.sun.star.sheet.addin.XTestAddIn -OC:\Users\martin\source\repos\libre_office_try\libre_office_try\out test.idl


Actual Results:
ERROR: Bad format of <file:///C:/Users/martin/source/repos/libre_office_try/libre_office_try/test.idl>, "cannot parse line 1, syntax error"

Expected Results:
a cpp header file


Reproducible: Always


User Profile Reset: No

Additional Info:
an example such as this:

https://niocs.github.io/LOBook/extensions/part10.html

using the updated toolchain would be appreciated!