today to try and solve this issue I did remove all previous nim folders and I installed it again using the most recent choosenim I could find: the release choosenim-0.5.1_windows_amd64 from github. I would assume that to install the 64bit version of Nim but maybe I am wrong (or maybe choosenim tries to infer the architecture and install the version he thinks is the correct).
Regardless of arch, even moving the dll sqlite3_32.dll in the same folder as my nim test file (and the resulting .exe) the error is still (when running the exe): could not load sqlite3_32.dll