'How to read an encrypted private key in the form of BEGIN PRIVATE KEY?

I have a private key that is in the following format, unfortunately I can't share the actual key, so the base64 code is masked:

So I have little application that comes from 2010, written by Huawei called CardManufactureFileDecrypt that uses the private key, a certificate and the password / passphrase to successfully decrypt files that contain vouchers, so from that I can deduce that the file is intact, also that the password or passphrase I have is correct.

So my question is does anyone know how to read an encrypted private key in the form of BEGIN PRIVATE KEY? Or perhaps what libraries from about 10 years ago would have produced / consumed keys in this style?

When I try to read the private key with openssl I get the following error(s):

$ openssl rsa -in PrivateKey_E8.p8 -out PrivateKey_E8_unencrypted.p8
unable to load Private Key
139978370384320:error:0906B082:PEM routines:PEM_get_EVP_CIPHER_INFO:unexpected dek iv:../crypto/pem/pem_lib.c:551:

Or:

$ openssl pkcs8 -in PrivateKey_E8.p8 -out PrivateKey_E8_unencrypted.p8
Error reading key
140719466078656:error:0909006C:PEM routines:get_name:no start line:../crypto/pem/pem_lib.c:745:Expecting: ENCRYPTED PRIVATE KEY

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'How to read an encrypted private key in the form of BEGIN PRIVATE KEY?

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