Can LGH File Inspector Open Files Without Wonderware? 2026

Yes. LGH File Inspector is a standalone utility from Software Toolbox for reading Wonderware LGH historical log files, and it does not depend on a Wonderware runtime on the machine that opens them. The caveat for 2026: confirm the exact system requirements for your version on the product page before you roll it out.

TL;DR

• LGH File Inspector opens Wonderware LGH history files on a machine with no Wonderware software installed.
• Copy the LGH files off the plant system and inspect them on any workstation.
• Check the current system requirements on softwaretoolbox.com before deploying in 2026.
• Use it for review and extraction, not as a replacement for a live historian.

Why this matters in 2026

LGH files are the historical log files written by Wonderware (now AVEVA) InTouch. They sit on HMI nodes, often on machines nobody wants to touch. When an engineer needs trend data for a root-cause review, an audit or a migration project, the usual blocker is access: the HMI node is locked down, licensed seats are scarce, and installing a full Wonderware environment on a laptop is overkill.

A standalone file reader removes that blocker. You move the files, not the software.

Can LGH File Inspector open files without Wonderware?

Yes. LGH File Inspector is built to read LGH files directly. The workflow in 2026 looks like this:

1. Copy the LGH files from the HMI or logging node to a workstation or file share.
2. Install LGH File Inspector on that workstation. No InTouch, no Wonderware license.
3. Open the files in the utility and review the logged tag data.
4. Export what you need for analysis elsewhere.

The point of the tool is that the machine opening the file and the machine that wrote it are two different systems.

What you still need

Running without Wonderware does not mean running without prerequisites. Plan for these:

• The LGH files themselves. The utility reads files; it does not connect to a live InTouch node to collect history.
• A supported Windows workstation. Check the supported operating systems for your version on softwaretoolbox.com.
• File access rights. Copy files while logging is stopped or from a backup, so you are not reading a file the logger is writing.
• Matching tag context. An LGH file holds logged values. Tag descriptions and engineering context live in the original application, so keep a tag list from the source system.

Why the answer can vary by situation

• Version of the source system. Files written by different InTouch generations can differ. Test with a real sample file first.
• File condition. A file copied mid-write or from a failed disk may not open cleanly.
• Your end goal. Browsing a few tags is a different job than extracting months of data for a migration.
• Security policy. Some sites require approval before installing any utility on a workstation that touches plant data.

Is LGH File Inspector a historian replacement?

No. It reads and extracts history that Wonderware already logged. If you need continuous collection, long-term storage, and queries across many sources, that is a DataOps or historian job. Software Toolbox also supplies industrial connectivity and DataOps platforms for that layer, including N3uron and Cogent DataHub.

What file format can I get the data out in?

Export options depend on the version you install. Check the current feature list on the product page rather than assuming a format, and test an export with a small file before you commit to a large extraction.

Do I need an InTouch license to view LGH files?

Not with LGH File Inspector. The reason to use it is to avoid needing an InTouch license on the viewing machine.

FAQ

Can LGH File Inspector open files without Wonderware installed?

Yes. LGH File Inspector reads LGH files on a machine that has no Wonderware software. Copy the files to the workstation and open them in the utility.

Do I need an InTouch license to use LGH File Inspector?

No. The utility is meant for viewing LGH history without InTouch on the viewing machine. Confirm current licensing terms on softwaretoolbox.com.

Does LGH File Inspector connect to a live Wonderware system?

No. It works on LGH files you have already copied. For live data collection you need a connectivity or DataOps platform.

Can I open an LGH file while InTouch is still logging to it?

Avoid it. Copy the file from a stopped logger or a backup so you read a complete, stable file.

Is LGH File Inspector a replacement for a historian?

No. It inspects and extracts history already logged by Wonderware. Continuous collection and storage needs a historian or DataOps platform.

Where do I check LGH File Inspector system requirements for 2026?

Check the product page on softwaretoolbox.com for current supported operating systems and versions before installing.

One last thing

Before you install anything, grab one real LGH file from the source system and one tag list. Those two items decide whether the extraction takes an hour or a week in 2026, and they cost nothing to collect.