dlls/msi/files.c |    2 +-
 dlls/msi/media.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dlls/msi/files.c b/dlls/msi/files.c
index d9470df..d09689b 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) || (err == 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 06f14e0..b50dc63 100644
--- a/dlls/msi/media.c
+++ b/dlls/msi/media.c
@@ -353,7 +353,7 @@ static INT_PTR cabinet_copy_file(FDINOTIFICATIONTYPE fdint,
             if (handle != INVALID_HANDLE_VALUE) goto done;
             err = GetLastError();
         }
-        if (err == ERROR_SHARING_VIOLATION)
+        if ((gle == ERROR_SHARING_VIOLATION) || (err == ERROR_USER_MAPPED_FILE))
         {
             WCHAR tmpfileW[MAX_PATH], *tmppathW, *p;
             DWORD len;