At least part of the problem is that Win32::API::Struct (or rather, Win32::API::Type) does have support for the STARTUPINFO structure, or at least not as of version 0.41 which is the latest version I can find.

The fact that you aren't receiving the warnings I get:

Unknown Win32::API::Struct 'STARTUPINFO' at - line 7
Can't call method "sizeof" on an undefined value at - line 8, <DATA> l
+ine 164.
[download]

means that either

• you don't have warnings enabled.

  If so, turn them on, it'll save you much grief:)

• You have a later version of the package than I have been able to find.

  If so, which version is it and where can I get a copy:)

• You have a (locally?) modified copy of the package.

  If so, consult the people that made the modifications.