Work around not-found textures.

As discussed in IRC and Discord, 3ds Max does some manipulation and
pretty much always successfully loads the bitmap data. Unfortunately,
we are trying to access the file manually here, which might be an
absolute path to a file on another machine. This path may not be valid
on our system, which fails, causing textures to be duplicated.

Sources/MaxPlugin/MaxConvert/plBitmapCreator.cpp

@@ -552,16 +552,23 @@ plBitmap *plBitmapCreator::ICreateTexture( plBitmapData *bd, const plLocation &l
     // Texture reuse optimization
     if( texture )
     {
-        WIN32_FILE_ATTRIBUTE_DATA fileAttrib;
-        GetFileAttributesExW(bd->fileName.WideString().data(), GetFileExInfoStandard, &fileAttrib);
-        FILETIME &fileTime = fileAttrib.ftLastWriteTime;
+        WIN32_FILE_ATTRIBUTE_DATA fileAttrib{};
+        if (GetFileAttributesExW(bd->fileName.WideString().data(), GetFileExInfoStandard, &fileAttrib) != FALSE)
+        {
+            FILETIME &fileTime = fileAttrib.ftLastWriteTime;
 
-        // If this texture has been modified since the last export, delete the old version but reuse the key
-        if (!texture->IsSameModifiedTime(fileTime.dwLowDateTime, fileTime.dwHighDateTime))
+            // If this texture has been modified since the last export, delete the old version but reuse the key
+            if (!texture->IsSameModifiedTime(fileTime.dwLowDateTime, fileTime.dwHighDateTime))
+            {
+                DeleteExportedBitmap( texture->GetKey() );
+                texture = nullptr;
+                key = nullptr;
+            }
+        }
+        else
         {
-            DeleteExportedBitmap( texture->GetKey() );
-            texture = nullptr;
-            key = nullptr;
+            // Well, this really sucks. We couldn't tell what the modify time is, so just pretend all is well (but assert in Debug mode)
+            hsAssert(0, ST::format("Couldn't get bitmap '{}' modify time: {}", bd->fileName, hsCOMError(hsLastWin32Error, GetLastError()).c_str()));
         }
     }