XmlConfig elements with long IDs

[wixbot]

I'm using XmlConfig within a merge module.

I have one element with an ID of length 35 characters and one of 40 characters (which do not seem unreasonable to me, since they are pointing to adding/removing particular elements in a tree. After the module GUID is concatenated I get build warnings warning about string overflow (although you get those all the time).

When I open the .msi in Orca, the strings do appear in full. If I manually remove the longest element the msi runs fine (despite the warnings at build time).

With the longer ID present (40 chars + GUID) though, the installer fails with a message saying "There was an error during XML configuration" (or something along those lines), and all that is the log file is:

MSI (s) (24!04) [17:14:16:727]: Creating MSIHANDLE (1159) of type 790531 for thread 4100
MSI (s) (24!04) [17:14:16:727]: Creating MSIHANDLE (1160) of type 790531 for thread 4100
SchedXmlConfig:  Error 0x8007007a: failed to copy XmlConfig record Id
MSI (s) (24!04) [17:14:16:728]: Closing MSIHANDLE (1160) of type 790531 for thread 4100
MSI (s) (24!04) [17:14:16:728]: Closing MSIHANDLE (1159) of type 790531 for thread 4100
MSI (s) (24!04) [17:14:16:728]: Closing MSIHANDLE (1105) of type 790540 for thread 4100
MSI (s) (24!04) [17:14:16:728]: Creating MSIHANDLE (1161) of type 790531 for thread 4100
SchedXmlConfig:  Error 0x8007007a: failed to read XmlConfig table
MSI (s) (24!04) [17:14:16:728]: Closing MSIHANDLE (1161) of type 790531 for thread 4100

Originally opened by oliverhallam