Windows Proxy and hi.ytd

Hi

I added a proxy to my FiveM server following this thread

Everything works fine but the files containing a “+” seem to cause a problem. Pay close attention to the difference : dw_poljackal+hi.ytd / dw_poljackal hi.ytd

I tried disabling the proxy and it works fine. What could cause this ?
(I can provide windows server configuration if needed)

Error message :
ResourceCacheDevice reporting failure downloading dw_poljackal+hi.ytd: HTTP 404: Not found. (missing requested file: DispatchWorksPack/dw_poljackal hi.ytd)