I have the same problem: Searching for a "text content" (e.g. "aee") in AutoCAD-DWG files brings nothing with TC, but the correct result with "Windows Explorer".
On my PC is installed a lot of Autodesk-software (AutoCAD, DWGTRueview, ...), and I know that one of these packages installed a "Search filter / Search extension". I have
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AcDwgFilter16.dll AcDwgFilter AcDwgFilter Module 16.2.54.0 16.2.54.0 Autodesk C:\Program Files\Common Files\Autodesk Shared\AcDwgFilter\AcDwgFilter16.dll {7F0A7E9C-4760-4db0-A875-B7BAEC4BA137} {8E77F05A-5BE0-463a-B07C-06C16F525297} 03.08.2006 09:04:01
Peter