That filename/URL looks like a suspicious installer (likely a RAR of an unknown setup executable). Do not run or install software from untrusted or unclear sources. Here’s a concise, actionable safety guide:
Connect your USB microscope or endoscope to the computer.
Open any browser like Google Chrome, Microsoft Edge, or Mozilla Firefox.
Most endoscopes have a fixed focal length. Move the camera lens closer to or further away from the object (usually 3cm to 10cm is the "sweet spot").