How do I distribute a dll with my vm sav file?

I'm kind of new to this dll thing - I've created a dll that works fine
for me - I just put it in C:\Program Files\ITT\IDL70\bin\bin.x86 et
voila!

Now I want someone else to use my sav file - but what do I do with the
dll?  I tried putting it in the bin directory on that machine...

Can you tell I really don't know what I'm doing?

TIA - Vince