If a graphics editor generates an error during the rendering phase, the file's internal 22-byte header may be corrupt. Repair the header by using a hex editor or by running the file through an automated metafile recovery tool.
Change the file's extension to .txt and open it in a basic text editor. If the first few characters show clear text variables (like Parameters or Variables ), it is an APMonitor file , not a vector image. apmfilecom
I can then provide direct for your specific operating system. How to open APM file (and what it is) - File.org If a graphics editor generates an error during
A specialized proprietary container used in older video game releases. it is an APMonitor file