When I see one of these threads, I'm usually a little confused.
What are you trying to solve with a consumer product that couldn't be (better) solved with an industrial one?
Is it just a cost issue? If so, I get it. But you'll likely spend more (money) time than the cost difference using an ill suited product due to inefficiencies. You also may introduce possible points of human error. It seems like it introduces too many possible issues/what ifs, that a commercial product designed for this purpose doesn't have.
If you have many files to process, depending on what kind of input system you are using, you may be able to automate the process too. This could save a ton of time.
There are probably dozens of companies with collectively hundreds of technical sales associates who will happily point you towards the right product for your situation.
The NI cRIO/cDAQ stuff can be pretty economical.
Voltage out and multi i/o (includes analog out) modules. The specs or ranges of specs seem more varied on the Voltage Out modules, but the multi I/O gives you room to grow for future projects.
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www.ni.com
You'll need to put them in a chassis, the cRIO single slot is probably the cheapest.
Template page for every B2B supported Category Page
www.ni.com
Edit: Also, is there not a way to view/process the files you already have, or do some kind of file/data conversion process into the new system/file type? Honestly speaking, this (digital file to analog out to another systems analog in to....?) seems like not a great way to do what you seem to be trying to do.