Here is why:

Downloading steam_api.dll from third-party sites is not recommended due to malware risks; instead, verify game files through Steam or check antivirus quarantine to resolve Resident Evil 6 missing file errors. Other solutions include reinstalling Microsoft Visual C++ Redistributables or restoring the file from quarantine. For a detailed guide on fixing DLL errors, see the ThinkMobiles article . (HELP!) Resident Evil 6 (Steam.api) Problem. | Fandom

If you search "download steam apidll for resident evil 6 pc fix", Google will show dozens of sites like dlldownload.com , fix4dll.com , or dll-files.com .