We need the 64 bit version for the GpgOL because there are 32 and 64 bit versions of outlook. Thus we also need a 64 bit gpgme and in turn a 64 bit libassuan and libgpg-error. I can't remember why we don't append the 6 to the gpgme dll, though.

I see no problems to add the 6 to all DLLs - it will eventually help out support team even if it is not technically required because we use a bin64 subdir.

My use case is using Wine, like this:

• having different bindir (/usr/local/i686-w64-mingw32 and /usr/local/x86_64-w64-mingw32)
• but I was too lazy to have different configurations for 32-bit and 64-bit, but to have shared configuration with
  • PATH adding both of /usr/local/i686-w64-mingw32 and /usr/local/x86_64-w64-mingw32

When a user wants running both of 32-bit applications and 64-bit applications, having different DLL name helps.

In my opinion, adding the "6" to all DLLs is good now (including gpgme), when we are going to support 64-bit version.