diff --git a/dlls/msi/files.c b/dlls/msi/files.c
index d9470df01fc..7e74dca9696 100644
--- a/dlls/msi/files.c
+++ b/dlls/msi/files.c
@@ -155,7 +155,7 @@ static UINT copy_install_file(MSIPACKAGE *package, MSIFILE *file, LPWSTR source)
         gle = copy_file(file, source);
         TRACE("Overwriting existing file: %d\n", gle);
     }
-    if (gle == ERROR_SHARING_VIOLATION)
+    if (gle == ERROR_SHARING_VIOLATION || gle == ERROR_USER_MAPPED_FILE)
     {
         WCHAR tmpfileW[MAX_PATH], *pathW, *p;
         DWORD len;
diff --git a/dlls/msi/media.c b/dlls/msi/media.c
index bc60b60ad4e..67d73ccfcaf 100644
--- a/dlls/msi/media.c
+++ b/dlls/msi/media.c
@@ -362,7 +362,7 @@ static INT_PTR cabinet_copy_file(FDINOTIFICATIONTYPE fdint,
             if (handle != INVALID_HANDLE_VALUE) goto done;
             err = GetLastError();
         }
-        if (err == ERROR_SHARING_VIOLATION)
+        if (err == ERROR_SHARING_VIOLATION || err == ERROR_USER_MAPPED_FILE)
         {
             WCHAR tmpfileW[MAX_PATH], *tmppathW, *p;
             DWORD len;