What is the APA file format?
.apa files belong to the category of project archive files used in industrial automation.
The content of .apa files are projects created using RSView Studio and RSView ME applications, developed by Rockwell Automation. They are used to store complete HMI (Human-Machine Interface) project data for industrial control panels such as PanelView Plus terminals. .apa files hold the complete data of each project; their contents may include:
- graphics and images,
- tag databases and alarm databases,
- macro scripts (
.basfiles), - configuration settings.
To ensure portability and minimize the space occupied, .apa files are automatically archived into a compressed package. As a result, they can be copied to other computers and used by anyone working with the dedicated software.
RSView ME and RSView32 were discontinued; Rockwell Automation migrated customers to FactoryTalk View ME/SE, which uses .mer runtime packages as its deployment format. The .apa format is largely frozen but legacy archives continue to circulate in industrial environments. Contents can be partially extracted with 7-Zip or WinRAR, though full project restoration requires RSView Studio or FactoryTalk View.
Security & safety
RISK: LOWAPA files are industrial project archives - not executable and not internet-distributed. They may contain PLC communication credentials, IP addresses of industrial control equipment, and facility-specific configuration. Treat as sensitive industrial intellectual property; do not share outside the organization.
Format details
in a nutshellPrograms that open APA files
Windows3 apps
RSView Studio (legacy)
Paid RSView Application Manager → Restore → browse to .apa file → select destination → restore project.
FactoryTalk View ME/SE
Paid FactoryTalk View Studio may be able to import legacy RSView ME projects; use Application Manager in the older product to restore first, then migrate.
WinRAR / 7-Zip (partial)
Freemium Some third-party reports indicate WinRAR can extract .apa archive contents for inspection; extraction does not restore the project - use RSView Application Manager for proper restore. Technical details
deep spec| Developer | Rockwell Automation (Rockwell Software division) |
| Container | Proprietary compressed archive (ZIP or CAB derivative); partially extractable with 7-Zip or WinRAR |
| Encoding | Binary, little-endian (Windows-native) |
| Project contents | Graphics (.gfx), tag databases, alarm databases, macro scripts (.bas), trend data, configuration files |
| Compression | Deflate or LZX (unconfirmed); compresses the entire HMI project directory tree |
| Typical file size | 1 MB-500 MB (depending on project graphics and component count) |
| Target hardware | PanelView Plus and other Rockwell Automation industrial HMI terminals |
| OS support | Windows (XP, Vista, 7, 10) |
| Successor platform | FactoryTalk View ME/SE (Rockwell Automation) - RSView ME/SE discontinued |
| Format status | Frozen - no new format versions since RSView ME/SE was discontinued (~2010) |
| Default archive path | C:\Documents and Settings\All Users\Documents\RSView Enterprise\ME\Archives (Windows XP) |
| Partial extraction | 7-Zip or WinRAR may list and extract file contents; full project restoration requires RSView Studio |
| Released | Early 2000s (RSView32 / RSView ME era, Windows XP) |
| Latest version | RSView ME/SE (superseded by FactoryTalk View; format frozen) |
APA conversions
Community Q&A
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