How to Open a File With the BAS File Extension

If you're looking to find out how to open the BAS file extension, you've come to the right place. In most cases, Windows will open a file in the associated program, but some files fall outside of those parameters. Keep reading to find out how you can open your BAS file on both Windows and Mac.

Problem: You Can't Open BAS Files

You might've double-clicked on the file, to be greeted with the "Choose a program to open the file" message. In some cases, you might be able to open the file, but the contents may seem garbled and that's because it was written to be opened in a specific program. Of course, you can't open a BAS file with just any software. Not to worry - we have you covered!

Step 1: Find Out Which Software Uses BAS Files

Computer Files

Opening your BAS file starts with understanding which software uses a BAS extension. In many cases, different types of software may use the same file extensions, also known as file associations.

CHDK UBASIC Script, VBDOS Pro 1.0 Source, and e.Report Designer Actuate Basic Source are the most popular software packages that use BAS files. Therefore, your best bet would be to download one of these software packages and use one of them to open your file.


Zipped files tend to require special handling and may require password access. Contact the file owner or the person who gave you the file for the password and unzip the file before attempting to open the contents.

Step 2: Learning More About BAS "File Type"

If you can't download CHDK UBASIC Script, VBDOS Pro 1.0 Source, or e.Report Designer Actuate Basic Source software, or if they don't work to open your BAS file, you may be able to use the file type as a clue to finding out how you can open it. Using a Windows PC, you can right-click and navigate to "Properties" and then to "Type of file". On a Mac, select "More info" and "Kind".

Most likely, you will find that BAS files are considered Developer Files. Because many programs packages utilize Developer Files, you might be able to find a program on your computer that handles those types of files.

If that still does not work, you may have to contact the associated software developer to find out how to open it. Unless you know the specific developer, you could contact one of these developers for assistance.

Please see our chart below of software titles and their developers:

Software Developer
CHDK UBASIC Script PC Software Company
VBDOS Pro 1.0 Source Unknown
e.Report Designer Actuate Basic Source Actuate Corporation
BASIC Source Code Unknown
HBasic Source Code Windows Programmer
QuickBASIC Extended v7.1 Source Microsoft Developer

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