I have very old DOS program, it was made 20 years ago in Clipper. I need to make some little modification. Ofc I tried Decompiling to ASM, but code looks horrible.

2 Answers

You didn't mention the Clipper version, but on Vetusware (the biggest free abandonware downloads collection in the universe) you can find a decompiler for version 5, dated 1994.It might suit your needs.

Some years ago I had one called 'Clipper Decompiler' or 'Unclipper' and its internal protection was:

• put in several places on your code, before compiling, this: ERRORSYS=0987654321

and no one will decompile your code with 'unclip'

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Clipper is an easy-to-use screen capture utility that supports saving images in 9 different image formats, such as JPEG, PNG, GIF (animating and non-animating), Windows Bitmap (BMP), Enhanced Metafile (EMF), TrueVision Targa, TIFF, AVI, ZSoft Bitmap (PCX).
Clipper has the following features:
Easy-to-use user interface
Supports saving images in 9 different formats, including animating animating GIF and AVI
Changing the hotkeys of capturing the screen and the active window
Saving with different types of settings with three user-selected hotkeys
Adding text, including current date and time, to pictures
Changing the quality of JPEG and the compression level of PNG images
Automatic Print Screen simulation with a custom delay, starting after a specified time, and stopping after a certain number of images
Multilanguage with easily translatable language files
Minimizing to system tray
Cropping and automatic resizing of captured images to user-selected size
Opening captured images in external programs, for example, Paint and PhotoShop
Adding other pictures to captured images
Adding mouse cursor to images
Setting the delay of GIF and AVI animations
Changing the Pixel Format (bpp) of Bitmap and TIFF images
Small description of every supported image format
Two effects: converting images to grayscale and inverting image colors
Starting automatically after logon
File output directory selection
Filename prefix and formatting selection
Creating a small web gallery of selected images
Built-in small help, and an external help file

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How do I uninstall Clipper in Windows Vista / Windows 7 / Windows 8?

• Click 'Start'
• Click on 'Control Panel'
• Under Programs click the Uninstall a Program link.
• Select 'Clipper' and right click, then select Uninstall/Change.
• Click 'Yes' to confirm the uninstallation.

How do I uninstall Clipper in Windows XP?

• Click 'Start'
• Click on 'Control Panel'
• Click the Add or Remove Programs icon.
• Click on 'Clipper', then click 'Remove/Uninstall.'
• Click 'Yes' to confirm the uninstallation.

How do I uninstall Clipper in Windows 95, 98, Me, NT, 2000?

• Click 'Start'
• Click on 'Control Panel'
• Double-click the 'Add/Remove Programs' icon.
• Select 'Clipper' and right click, then select Uninstall/Change.
• Click 'Yes' to confirm the uninstallation.

• How much does it cost to download Clipper?

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• How do I access the free Clipper download for PC?

It's easy! Just click the free Clipper download button at the top left of the page. Clicking this link will start the installer to download Clipper free for Windows.

• Will this Clipper download work on Windows?

Yes! The free Clipper download for PC works on most current Windows operating systems.