Listing names of files in folder on form

I am having troubles trying to list on a form all files in a folder based on criteria.

I have tried both Allen Browne's solution and Daniel Pineault's solution, and they both seem* to work for ALL files in the folder.

What I need is the list to only show file names that start with a SKU # displayed in a text field ( [txtStockCode] ) on the form the listbox is on.

So something like - \folder\Archive BOM Copies\ & Me.[txtStockCode] & " *.htm "

For starters, would there be a better way to do this other than a listbox, like a sub-form?

If not, any ideas how I can filter the listbox based on what is in [txtStockCode] ?

Ultimately I want a clickable link to be able to open these files.

*I say seem to work as the file names that are displayed only show the name until there is a comma or parentheses in the file name. The files are saved to the folder as a concatenation of SKU+Description+Date(), and description commonly has comma's and occasionally parentheses. 

Also, it doesn't show all files in the list, there are ~2500 files in the folder and growing daily and it only scrolls down a few hundred. Maybe a non-issue as I only want it to be able to show the ones that match the text field.

Any help is appreciated, thanks!