1 files changed, 7 insertions, 1 deletions
diff --git a/generic/tclPipe.c b/generic/tclPipe.c
index d6cd188..b679ec4 100644
--- a/generic/tclPipe.c
+++ b/generic/tclPipe.c
@@ -668,7 +668,13 @@ TclCreatePipeline(
 	    if (*p == '>') {
 		p++;
 		atOK = 0;
-		flags = O_WRONLY | O_CREAT;
+
+		/*
+		 * Note that the O_APPEND flag only has an effect on POSIX
+		 * platforms. On Windows, we just have to carry on regardless.
+		 */
+
+		flags = O_WRONLY | O_CREAT | O_APPEND;
 	    }
 	    if (errorClose != 0) {
 		errorClose = 0;