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How to open .ATC files on Windows

To open .ATC files on Windows, if the file came from an ACUCOBOL-GT Thin Client system, install or use the Micro Focus ACUCOBOL-GT Thin Client environment and open the .ATC file with acuthin.exe.

Step-by-step instructions

  1. If the file came from an ACUCOBOL-GT Thin Client system, install or use the Micro Focus ACUCOBOL-GT Thin Client environment and open the .ATC file with acuthin.exe.
  2. If the file came from an AutoCAD workflow, open or reference it in Autodesk AutoCAD or AutoCAD Civil 3D as a Tool Catalog file.
  3. If you are unsure which type it is, open a copy in a plain-text editor first; AutoCAD Tool Catalog files are XML-like, while ACUCOBOL-GT files contain Thin Client launch parameters.
  4. Do not rename the file extension to force another program to open it.

Alternative methods

  • Open .ATC in a browser-based viewer if desktop apps fail.
  • Try opening .ATC on Windows with a secondary app to rule out app-specific issues.
  • Convert .ATC only with trusted tools when direct opening is not possible.

Common issues

The wrong program opens the .ATC file

The .ATC extension is used by more than one documented format, so file associations can be misleading.

  1. Confirm the source of the file: ACUCOBOL-GT Thin Client deployment or AutoCAD tool palette/catalog workflow.
  2. Open a copy in a text editor to look for XML tool catalog data or Thin Client command-line parameters.
  3. Change the Open With association only after you know which application created the file.

ACUCOBOL-GT .ATC file does not launch

The Thin Client may not be installed, the file may not be associated with acuthin.exe, or the command-line parameters may not match the target deployment.

  1. Install or update the Micro Focus ACUCOBOL-GT Thin Client software required by the organization that provided the file.
  2. Associate .ATC or .ACUTC files with acuthin.exe if your deployment expects double-click launching.
  3. Ask the administrator or sender to verify the server, path, and parameter values in the .ATC file.

Web-launched .ATC file downloads instead of opening

For Thin Client web launching, the server must send the file with the expected Thin Client MIME content type and the client machine must have a handler installed.

  1. Confirm that the workstation has the required Thin Client software installed.
  2. Ask the website administrator to verify the MIME/content-type configuration for .ATC or .ACUTC files.
  3. Save the file and open it manually with the intended Thin Client application if permitted by your organization.

AutoCAD does not show the expected tools

An AutoCAD .ATC Tool Catalog file may reference tool data, paths, or resources that are not available on your computer.

  1. Open the file in the AutoCAD environment that matches the project or organization that supplied it.
  2. Check whether referenced tool palettes, blocks, support files, or network paths are available.
  3. Ask the sender to provide the complete tool catalog package, not just the .ATC file, if items are missing.

Security note

ACUCOBOL-GT .ATC files can contain launch parameters for a Thin Client session; review files from untrusted sources before opening because they may cause the client to connect to an unexpected host or application.

Back to .ATC extension page