Verify where you downloaded it. If it came from an unverified source or a suspicious email, do not run it. Where did you find this file , or wihajster - Wiktionary, the free dictionary
If you have encountered this specific filename, it could refer to: Wihajster.V0.6.exe
It typically refers to a mechanical part, a gadget, or a "jigamaree" used to fix something. Potential Origins of the File Verify where you downloaded it
In Polish, is a colloquialism used to describe a "thingy," "whatchamacallit," or a small tool/part whose name the speaker has forgotten. or wihajster - Wiktionary
Because this is an executable ( .exe ), you should exercise caution:
It is a phonetic adaptation of the German phrase "wie heißt er?" (literally: "what is his name?").