Yes, dcomp.dll is DirectX which is used for image viewer and other viewers.
These are new dlls that are present only in from Win 8.1 version or so, used for PDFViewer.
So Wine doesn’t have this dlls because are new or IDK , and cannot include DirectX dlls because of copyrights probably.
Maybe in a future update will have them.
Anyway we don’t target to run myco under wine on linux, so i don’t see a point here.
MyCo is written entirely in C++ and Win32.
You don’t need any .Net.