I tried to run the fitsio tutorials with Windows Visual Studio binary root_v6.28.04.win64.vc17.exe.
It failed with:
cling::DynamicLibraryManager::loadLibrary(): LoadLibrary: returned 126: The specified module could not be found.
Error in : Failed to load library C:\root_v6.28.04\bin\libFITSIO.dll.