There is a known environmental data management software called by EarthSoft. While their standard files usually start with EarthSoft.*.dll , they utilize various SDK components and report-specific DLLs.
: If you recently installed a niche software product, financial tool, or proprietary business application, this DLL likely belongs to it. equlent_sdk.dll
: Run a full system scan with Windows Defender or your preferred antivirus to ensure the file is not malicious. There is a known environmental data management software