WinUSB x64 system app shows winusb.dll not found

Hi

I have installed WinUSB driver for some device on WinXP 64 bit .

Here is some problem that when my app use WinUSB API run there is some
message which shows winsub.dll is not found .

But winusb.dll is right there in Windows\System32 , what's the problem ?

This problem did not happen on WinXP 32 bit .

Thank for your helping .

You need to install both x86 and x64 variants of the DLL. x64 one goes to
system32, x86 one goes to syswow64.

"Kid" <> wrote in message
news:407B09E0-EC3F-4336-BCCF-...
> Hi
>
> I have installed WinUSB driver for some device on WinXP 64 bit .
>
> Here is some problem that when my app use WinUSB API run there is some
> message which shows winsub.dll is not found .
>
> But winusb.dll is right there in Windows\System32 , what's the problem ?
>
> This problem did not happen on WinXP 32 bit .
>
> Thank for your helping .