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Follow These Easy Steps to Open CLS Files

Step 1: Double-Click the File

Before you try any other ways to open CLS files, start by double-clicking the file icon. The file should open automatically. If it doesn’t open, or you see an error message, move on to Step 2.

Step 2: Choose the Right Program

There are many different programs you can use to open CLS files. If the file doesn’t open when you double-click it, you may not have one of these programs on your computer. Try installing the most common programs associated with CLS files, like C++ Class Definition, Visual Basic Class Module, or ArcView Geocoding Classification File. If none of these programs work, move to Step 3.

Step 3: Figure Out the File Type

The file type can give you a clue as to which programs can open your CLS file. Files with the CLS extension are usually Developer Files. If you’re not sure what the file type is, follow the steps below to find it:

Computer Woman
Using Windows:
  1. Right-click the file’s icon
  2. Click “Properties
  3. Find the file type listed under “Type of File
Using a Mac:
  1. Right-click the file’s icon
  2. Click “More Info
  3. Find the file type listed under “Kind

Once you know the file type, you can use this information do some searching for other possible programs that utilize file extension CLS or that open Developer Files. If this still doesn't help, move to Step 4.

Step 4: Check with the Software Developer

The most common programs associated with CLS files are all created by different software developers. These developers can help you if you’re having trouble opening your CLS file. Find your program in the left column of the table below and contact the developer listed in the right column.

Software Developer
C++ Class Definition Microsoft Developer
Visual Basic Class Module Microsoft Developer
ArcView Geocoding Classification File ESRI
JavaScript Class Microsoft Developer
MS VisC++/Visual Basic Class Definition Windows Software
MS VB-4 Class Module Add-In Microsoft Developer
LaTeX Class Definitinon Microsoft Developer


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