The network folks who control our site have prevailed upon me to migrate my production machine from XP to Windows 7. I'd copied out the production folders, and copied them back in after the migration. Now, when I run my program, I get a pop-up which reads:
"The program can't start because libiomp5md.dll is missing from your computer. Try reinstalling the program to fix this problem."
This being a console program, there is no installation beyond copying it into a folder. I'm sure I must have addressed this issue four or so years ago when I acquired the production machine (I build the program on a different computer), but can't remember how. I promise this time I'll write the answer down.