Hello,

I’m seeing a reproducible issue with MultiTerm COM automation when creating a local termbase from an .xdt definition.

Environment

• MultiTerm Desktop 2022 SR2 - 17.2.5.2838

• Trados Studio 2022 SR2 - 17.2.12.19268

• C# app running as x86 (Environment.Is64BitProcess = False)

• Interop: Sdl.MultiTerm.TMO.Interop

Code

Sdl.MultiTerm.TMO.Interop.Application oMt = new Sdl.MultiTerm.TMO.Interop.Application();
TermbaseRepository oLocalRep = oMt.LocalRepository;
oLocalRep.Connect("", "");

Termbases oTbs = oLocalRep.Termbases;
oTbs.New(name, "", definition, sdltbPath);

Example values used

• name = "Test"

• definition = C:\Users\...\Temp\Test_20260409_141955534\Test.xdt

• sdltbPath = C:\Users\...\Temp\Test_20260409_141955534\Test.sdltb

What I tested

• The process is 32-bit (Environment.Is64BitProcess = False)

• definition exists

• sdltbPath does not exist before calling New(...)

• Creating in %TEMP% gives the same result as other local paths

• Opening an existing .sdltb through COM works:

oLocalRep.Termbases.Add(existingTbPath, "", "");
var tb = oLocalRep.Termbases[existingTbPath];

• MultiTerm Desktop can successfully create the termbase from the same .xdt

Observed behavior

• Termbases.New(...) throws:

  • System.Runtime.InteropServices.COMException: 'MultiTerm is unable to create the termbase.'

• After a lot of testing, I found that the problem is related to Croatian in the .xdt

• If I remove Croatian from the termbase definition, Termbases.New(...) succeeds

• If Croatian is present, Termbases.New(...) fails

• However, MultiTerm Desktop is able to create the same termbase from the same .xdt

Question

• Is this a known issue in the MultiTerm COM API with Croatian language handling during termbase creation?

• Is there a specific Croatian language code/locale that COM expects here?

• Could this be related to SH-HR vs hr-HR handling?

Since Desktop can create the termbase, but COM cannot when Croatian is included, this looks like an API-specific issue rather than a broken .xdt.

Thanks in advance for any guidance.