On Mon, Jan 01, 2018 at 10:03:44PM +0000, David C Brown wrote: > [...] Wouldn't a corrupt WinUSB.dll cause problems with other USB > devices? Only if other applications used USB devices via that library; if they use the system kernel library (such as for filesystem access), they would not be affected. Also there could be intentional "corruption", such as system updates, shims, or malware, that have only been tested with more popular devices. > And can I simply replace WinUSB.dll to test this theory.? I expect so, but I'm not a Windows expert. Compare it across systems you have access to. --=20 James Cameron http://quozl.netrek.org/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .