Using Windows API in C++ to decrypt a file encrypted with openssl command line

Question

I have to decrypt a file using Windows API (Cryptography or CNG) in C++ on Windows Embedded Compact 2013.

The file was encrypted by the following shell script using openssl command line:

_log "generate random password file"
openssl rand -out "${filename_password_txt}" -hex 64

_log "encrypt file using generated random password file"
_log "  filename_to_encrypt = ${filename_to_encrypt}"
_log "  filename_encrypted  = ${filename_encrypted}"
_log "  password.txt        = ${filename_password_txt}"
openssl enc -aes-256-cbc -pbkdf2 -iter 100000 -salt -in "${filename_to_encrypt}" -out "${filename_encrypted}" -pass file:"${filename_password_txt}"

_log "encrypt password file using the public key"
openssl rsautl -encrypt -inkey "${filename_public_key}" -pubin -in "${filename_password_txt}" -out "${filename_password_enc}"

In my windows code i have the private key, the encrypted password and the encrypted data file.

So i have to translate following openssl commands to Windows API:

_log "decrypt encrypted password file using the private key"
openssl rsautl -decrypt -inkey "${filename_private_key}" -in "${filename_password_encrypted}" -out "${filename_password_decrypted}"

_log "decrypt data file using the decrypted password"
openssl enc -d -aes-256-cbc -pbkdf2 -iter 100000 -in "${filename_datafile_encrypted}" -out "${filename_datafile_decrypted}" -pass file:"${filename_password_decrypted}"

I'm a bit lost because i haven't used the cryptography functions of Windows before. Did anyone have done something similar before and can share some ideas?