Referencing an executable from F#

I've used F# to do some quick data-analysis using datastructures from another project. To do so, it needs access to this project; i.e. it needs an assembly reference - but the project is an executable.

I've tried this in F# interactive, and it almost works*; I can #I the appropriate path and #r the executable and a few support dll's - but I can't actually use em. And whatever I do, I can't get the reference into a compiled F# program: VS lets me add a reference just fine, and the appropriate compiler option -r:X:full\path\here.exe is correctly generated by the project, but none of the datastructures are present and the compiler complains of non-existent namespaces; it's as if the reference didn't exist. The application is 64-bit, which may be relevant. 64-bit dll's work fine.

(*) after setting fsi.exe to 开发者_JAVA技巧run in 64-bit mode it thinks it can load it, but actually using it returns FS0193: internal error.

How can I reference a managed 64-bit executable from an F# project?

To others with this same issue: as a workaround, I'm now compiling the executable as Any CPU (which will be executed in 64-bit mode, so behaves the same). This allows FSI and the compiler to reference it. Based on the questions referenced in the comments, this seems to be a known bug that will hopefully be fixed some day.