For full details/discussion https://forum.lazarus.freepascal.org/index.php/topic,74031.0.html How to reproduce, Faced this issue while trying importtl with Microsoft Debug Interface Access COM DLL 1. run `importtl.exe msdia140.dll` 2. the resulting pascal file has incorrect declaration for all property getters, e.g Excerpt from Typelib viewer (just to double-check that TLB is fine) `\[id(0x0000000a), propget, helpstring(".")\] HRESULT relativeVirtualAddress(\[out, retval\] unsigned long\* pRetVal);` the corresponding declaration is `function Get_relativeVirtualAddress : LongWord; stdcall;` In short the getter takes a `pointer to LongWord as argument` to store the output/result and returns `HRESULT`, but it gets declared as a `function returning LongWord with no argument`. which of course causes access violation errors. **Possible fix tried**, Manually replacing (calling convention) **`"stdcall"`** with **`"safecall"`** for all getter declarations fixes the issue.