The phrase "ШЄШЩ…ЩЉЩ„ max txt" appears to be a result of (often called "mojibake"). When interpreted as Windows-1256 (Arabic) characters being incorrectly displayed or processed, the first word "ШЄШЩ…ЩЉЩ„" translates to "تحميل" , which means "Download" in Arabic.
This specific string is frequently found in the comment sections of blogs and forums. It is typically associated with:
Often, these comments contain links to external sites or file-hosting services under the guise of a "max txt" file.
The full intended phrase is likely (Download max txt). Context and Origin