Build 4.0.0.37 of xlsgen supports all cryptographic providers that may be used in order to decrypt XLS files (and their variants), namely :

- Weak Encryption (XOR)
- Office 97/2000 Compatible (RC4 + MD5)
- RC4, Microsoft Base Cryptographic Provider v1.0
- RC4, Microsoft Base DSS and Diffie-Hellman Cryptographic Provider
- RC4, Microsoft DH SChannel Cryptographic Provider
- RC4, Microsoft Enhanced Cryptographic Provider v1.0
- RC4, Microsoft Enhanced DSS and Diffie-Hellman Cryptographic Provider
- RC4, Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype) (Windows XP only)
- RC4, Microsoft Enhanced RSA and AES Cryptographic Provider
- RC4, Microsoft RSA SChannel Cryptographic Provider
- RC4, Microsoft Strong Cryptographic Provider