I am working on converting a powershell script to Racket that takes a Word
XML document and saves it as PDF.
In powershell, when I call Word's `Documents.Open` method I can just pass
it the naked string as the file path without anything special done to it.
In Racket, however, when I run the following code I get an error telling me
the type is bad
```
(define xml-document (string-append (path->string (path->complete-path
(build-path (find-system-path 'orig-dir) "temp"))) "\\" tag ".xml"))
(define pdf-document (string-append (path->string (simplify-path
(path->complete-path (build-path 'up "formatted")) #t)) "\\" tag ".pdf"))
(define word-instance (com-create-instance "Word.Application"))
(define word-document (com-invoke (com-get-property word-instance
"Documents") "Open" xml-document))
(com-invoke book "ExportAsFixedFormat"
pdf-document
17 com-omit com-omit com-omit com-omit com-omit com-omit com-omit
com-omit
1)
(com-invoke book "Close")
(com-invoke word-instance "Quit")
(com-release word-instance)
```
This gives the following error on the line the **define word-document**
> Open: expected argument of type <(opt (box any))>; given:
> "...\\pdf_gen\\temp\\filename.xml"
I am very confused by this as the documentation suggests that I should be
able to plug in the path as a string, the error suggests otherwise?
I've tried both the regular and CS versions of Racket 7.4
Relevant Racket and Word documentation:
[Racket COM
Documentation](https://docs.racket-lang.org/foreign/com-auto.html?q=com)
[MS Word COM Open
Method](https://docs.microsoft.com/en-us/dotnet/api/microsoft.office.interop.word.documents.open?view=word-pia#parameters)
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