We've been using __int64 type as 64-bit integer type. However it is MS compiler specific type.
There is standard long long type which is also 64-bit integer. But earlier we could not use long long type as the VC6 compiler did not know it. So we had no other choice than using __int64 for VC6 compatibility.
Now that we aren't supporting VC6 anymore we can start using long long and convert existing __int64 usages to long long.
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