Add longPathAware to Burn manifest to support long paths.

Fixes 3455

1 files changed, 7 insertions, 0 deletions

diff --git a/src/burn/engine/exeengine.cpp b/src/burn/engine/exeengine.cpp
index f7be082d..701adb74 100644
--- a/src/burn/engine/exeengine.cpp
+++ b/src/burn/engine/exeengine.cpp
@@ -695,6 +695,7 @@ extern "C" HRESULT ExeEngineRunProcess(
     BOOL fDelayedCancel = FALSE;
     BOOL fFireAndForget = BURN_PACKAGE_TYPE_EXE == pPackage->type && pPackage->Exe.fFireAndForget;
     BOOL fInheritHandles = BURN_PACKAGE_TYPE_BUNDLE == pPackage->type;
+    size_t cchCachedDirectory = 0;
 
     // Always add user supplied arguments last.
     if (wzUserArgs)
@@ -703,6 +704,12 @@ extern "C" HRESULT ExeEngineRunProcess(
         ExitOnFailure(hr, "Failed to append user args.");
     }
 
+    // CreateProcessW has undocumented MAX_PATH restriction for lpCurrentDirectory even when long path support is enabled.
+    if (wzCachedDirectory && FAILED(::StringCchLengthW(wzCachedDirectory, MAX_PATH - 1, &cchCachedDirectory)))
+    {
+        wzCachedDirectory = NULL;
+    }
+
     // Make the cache location of the executable the current directory to help those executables
     // that expect stuff to be relative to them.
     si.cb = sizeof(si);