An ARH file does not have one fixed meaning, so determining its purpose requires examining where it came from; frequently it’s linked to Siemens ProTool in industrial automation, where it’s a compressed HMI project package used for backups or transfers—likely if seen alongside Siemens or PLC-related terms—whereas in archaeological work an ARH file may be an ArheoStratigraf project capturing stratigraphy data and Harris Matrix diagrams, often found in folders related to contexts, trenches, layers, or site documentation.

To determine what your ARH file actually is, the most direct check is to try opening it with 7-Zip or WinRAR because many ARH files act as archive containers; if it opens, you can inspect the extracted contents—project directories, configs, images, databases—which usually hints at a ProTool-style packaged project, whereas a failure to open often just means it’s in a proprietary format requiring ProTool or ArheoStratigraf, and a useful trick is renaming a copy to `.zip` or `.rar` to see whether it extracts, with the best opening strategy depending on your needs: if you only want assets, extraction may be enough, but proper viewing/editing requires the original program.

Because many ARH files store data in archive-like containers, tools like 7-Zip or WinRAR are worth trying early, since they can instantly confirm whether the ARH is a browseable archive; if it opens, the internal files—project directories, configs, images, logs—usually reveal what software it belongs to, and you can extract items without needing the original app, while an inability to open typically means the format is proprietary, and renaming a copy to `.zip` or `.rar` can expose hidden archives, making this a simple way to identify the ARH and recover content.

An ARH file cannot be interpreted by extension alone because ".ARH" isn’t controlled by a global standard and is reused across unrelated software, meaning two files with the same extension may contain totally different structures; context is the key—Siemens automation projects typically use ARH as a compressed HMI package, whereas archaeological setups use it as an ArheoStratigraf project—and proper identification comes from examining its origin, surrounding files, and whether it behaves like an extractable archive.

In real use, ".ARH" functions more as a label than a format, allowing different software to assign it to unrelated data; thus an automation-sourced ARH might be a Siemens/ProTool HMI package containing screens, configurations, alarms, and tag databases, while an archaeology-sourced ARH could be an ArheoStratigraf project with stratigraphy links and diagram information, and similar filenames may mask these differences, so identifying it requires checking context and testing with tools like 7-Zip to distinguish between an archive and a proprietary project.

You can determine an ARH file’s nature by checking the *context around it*—folder names, neighboring files, and workflow—since ".ARH" can mean different things; when it sits in automation-related folders with Siemens, ProTool, WinCC, STEP7/S7, PLC, or alarm/tag references, it’s likely a Siemens ProTool compressed project, but when stored in archaeology folders referencing trench, stratigraphy, layers, or context numbers and surrounded by drawings, photos, or excavation spreadsheets, it’s probably ArheoStratigraf, and if still unclear, trying 7-Zip helps: archive-like behavior suggests a packaged project, and failure to open implies proprietary software is needed.