This isn't the case.
if I do base64 to the .key file what I get is: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and if I do the complete openSSLComand I mentioned before I get:
user@user:~/$ openssl pkcs8
-inform DER -in aaqm610917qja_1011180955s.key
Enter Password:
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----