Because sometimes i use class _cryptapi i dont obtain success in invert process of encryption ?
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>I saw that it depends of SO of the machine
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>It is then a doubt. How to make the class _cryptapi to function in all versions of the SO ?
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>One exactly archive can need to be unencrypt by the same routine, however executed for different machines.

Lázaro

That is because MS changed to a better algorithm when the US Export Laws for encryption were relaxed, allowing 128-bit encryption instead of 40-bits.

To make it work make sure you use the same CSP (RSAENH.DLL)