Hi Becky,
I do not think that this forum's competence lies in embroidery file formats. I would guess that sewing related sites could help much more.
This said, I googled and found this (without any warranty of it's fitness for your use): Embird - Embroidery Software for Computerized Machine Embroidery . Also your sewing machine manufacturer may offer or recommend some software to be used.
The problem I see in your configuration is the file association of Acrobat with VIP files. Acrobat cannot open VIP files, so it should not be associated to those files.
And a last tip: Download the file to your disk and transfer to the flash drive. You do not need to pass through any program beforehand, except if you will modify the file/design somehow.