save_attachments with nested msg messages dose not work

[tbobin]

Hi,
I have a msg file that has 2 attachments an Excel file and a msg file.
The attached msg file has also 2 attachments 1 picture and 1 excel file.
So the structure is like this:
Msg
-.msg
-- .png
-- .xlsx
-.xlsx

If I try to save the attachments with msgxtractr::save_attachments(msg_file, use_short = F)
I get follwing error:

> msgxtractr::save_attachments(msg_file, use_short = F)
Saving D:/Entwurf/R/msgexample/R_logo.png (22,097 bytes)Saving D:/Entwurf/R/msgexample/Excel_file_1.xlsx (22,097 bytes)
Error in file(con, "wb") : invalid 'description' argument

To me, it seems that the read function reads all nested msg files and "saves" all attachments from this second msg file in one list element. But the save function cannot deal with several attachments in one element...

> sessionInfo()
R version 3.4.4 (2018-03-15)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252    LC_MONETARY=German_Germany.1252
[4] LC_NUMERIC=C                    LC_TIME=German_Germany.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] msgxtractr_0.2.1

loaded via a namespace (and not attached):
[1] colorspace_1.4-0 scales_1.0.0     compiler_3.4.4   tools_3.4.4      yaml_2.2.0       Rcpp_1.0.0       munsell_0.5.0