It appears something has broken between the last time I used this and now.
After setting the manual override to Unreal 3 > Dungeon Defenders, I'm able to see the list of packages but whenever I attempt to open one I get an error. Here are some of the errors I get when attempting to open a package:
ERROR: Trying to allocate -396123132 bytes
appMalloc:size=-396123132 <- FArray::Empty:-1106752085 x 12 <- SerializePackageFileSummary3 <- FPackageFileSummary<<:Ver=687/111 <- UnPackage::UnPackage:StartupCoop.upk, ver=687/111, game=8000 <- UnPackage::LoadPackage:StartupCoop.upk <- CUmodelApp::ShowPackageUI <- Main:umodel_version=462
******** Loading object Material3'DD2_Glitterhelm.LF_Add_Unlit' ********
ERROR: Trying to allocate 531805192 bytes
appMalloc:size=531805192 <- FArray::Empty:-2014532350 x 4 <- TArray::Serialize:0/0 <- SerializeFMaterialResource <- LoadObject:Material3'DD2_Glitterhelm.LF_Add_Unlit', pos=287E9F6, ver=685/111, game=8046 <- UObject::EndLoad <- LoadWholePackage:DD2_Glitterhelm <- CUmodelApp::ShowPackageUI <- Main:umodel_version=462
******** Loading object Material3'Startup_INT.PSprite_Additive_FC_SubUV' ********
ERROR: Trying to allocate -398236672 bytes
appMalloc:size=-398236672 <- FArray::Empty:974182656 x 4 <- TArray::Serialize:0/0 <- SerializeFMaterialResource <- LoadObject:Material3'Startup_INT.PSprite_Additive_FC_SubUV', pos=3A0FD2, ver=685/111, game=8046 <- UObject::EndLoad <- LoadWholePackage:Startup_INT <- CUmodelApp::ShowPackageUI <- Main:umodel_version=462
******** Loading object Material3'DD2_TownSquare01.PMesh_Additive_CG_Panner' ********
ERROR: Trying to allocate -2072440824 bytes
appMalloc:size=-2072440824 <- FArray::Empty:-1591852030 x 4 <- TArray::Serialize:0/0 <- SerializeFMaterialResource <- LoadObject:Material3'DD2_TownSquare01.PMesh_Additive_CG_Panner', pos=2A117A6, ver=685/111, game=8046 <- UObject::EndLoad <- LoadWholePackage:DD2_TownSquare01 <- CUmodelApp::ShowPackageUI <- Main:umodel_version=462
Here is a UPK file that can be used to test:
https://www.dropbox.com/s/xb9wk1e4kgeunit/TownSquare03_Incursion.zip?dl=0Also worth noting is that the original Dungeon Defenders works without any issues, however Dungeon Defenders 2 does not work.