zlib issue compiling under windows

[mmaypo]

brand new to otel-cpp, and tried to build otel-cpp under windows 10 VS2022 v17.14.9 First step was to set up windows environment in powershell with:
\ci\setup_windows_ci_environment.ps1
zlib was missing so installed it using the vcpkg in the tools dir, and got zlib_1.3.1_x64-windows successfully installed. so now, i'd like to build otel-cpp for an otlp grpc log app, and ran into a problem: CMake config step claimed ZLIB_LIBRARY was missing, so i added explicit paths to the config line and got past that. All the absiel, and a bunch of grpc libs built, but the next issue is a show stopper:

LINK : fatal error LNK1104: cannot open file 'D:\dev\working\github\opentelemetry-cpp\tools\vcpkg\packages\zlib_x64-windows\lib.obj' [D:\dev\working\github\opentelemetry-cpp\build\ext\src\dll\opentelemetry_cpp.vcxproj]

missing lib.obj really doesn't make sense.

config line (which builds properly under linux)

cmake .. -DWITH_STL=ON -DWITH_ZLIB=ON -DBUILD_LOGS_PREVIEW=ON -DWITH_ABI_VERSION_1=OFF -DWITH_ABI_VERSION_2=ON -DWITH_STL=ON -DCMAKE_CXX_STANDARD=17 -DBUILD_TESTING=OFF -DWITH_EXAMPLES=OFF -DOPENTELEMETRY_BUILD_DLL=ON -DWITH_OTLP_HTTP=OFF -DWITH_OTLP_GRPC=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DZLIB_LIBRARY:FILEPATH=D:\dev\working\github\opentelemetry-cpp\tools\vcpkg\packages\zlib_x64-windows\lib -DZLIB_INCLUDE_DIR:PATH=D:\dev\working\github\opentelemetry-cpp\tools\vcpkg\packages\zlib_x64-windows\include

My question is: I don't understand why the zlib problems. Are there some further windows tweaks to get this working or ??