This will convert any PAYDAY 2 normalmaps broken by Update 199.3 to the proper type of DDS compression (A8L8).
Note that this will only work on normalmaps that already had the proper channel setup (i.e. Y on RGB and X on Alpha).
If not, you'll need to fix the channels manually then run this tool.

Place the .texture (or .dds) files you want to convert into the folder, then run "Convert Normal Maps.bat".
The converted files will be placed in the appropriately titled "converted" folder.