echo job_start(...) doesn't show process id on windows.
diff --git a/src/eval.c b/src/eval.c
index 33f95ef..f5fb5f8 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -21606,6 +21606,10 @@ get_tv_string_buf_chk(typval_T *varp, char_u *buf)
# ifdef UNIX
vim_snprintf((char *)buf, NUMBUFLEN,
"process %ld %s", (long)job->jv_pid, status);
+# elif defined(WIN32)
+ vim_snprintf((char *)buf, NUMBUFLEN,
+ "process %ld %s", (long)job->jf_pi.dwProcessId,
+ status);
# else
/* TODO */
vim_snprintf((char *)buf, NUMBUFLEN, "process ? %s", status);