A1 File Type

Reporter:   |   Last Updated: November 26, 2018

Microsoft Silver

A1 File Summary

Most A1 files can be viewed with Free Pascal from Open Source (the only known affiliated software application) and associated with the Free Pascal Archive format as it's primary file type. A1 files are categorized ordinarily as Compressed Files.

The A1 File Extension can be viewed on the Windows, Mac, and Linux operating systems. They are supported on both desktop and mobile devices. A1 files have a "Low" Popularity Rating; this means that they are not present on most devices.

If you would like to learn more about A1 files and the software that opens them, please see the additional detailed information below. Also, you can learn how to do some basic A1 file troubleshooting if you are having trouble opening these files.

Low
Popularity
3336
Rank

/ 11690

Active

Status

26

November

2018

Edited

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A1 Types


Leading A1 Type

.A1
File Format:.a1
Category:Free Pascal Archive

The file stores archive from Free Pascal, an open source Pascal and Object Pascal languages' compiler.

Developer: Open Source
Function:Compressed Files
Folder: HKEY_CLASSES_ROOT\.a1

Software Programs That Open The Free Pascal Archive:


Free Pascal by Open Source

Windows
Mac
Linux
OS/2
FreeBSD
NetBSD
SunOS
BeOS

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A1 Requests


Primary OS Ranking

Windows (97.14%)
Macintosh (2.06%)
Linux (0.73%)
Chrome (0.05%)
Other (0.01%)


Sources of A1 Problems


Typical A1 Opening Challenges

Free Pascal Disappeared

When trying to open your A1 file, you get the error "Can't Open A1 File Type". Usually, this is because you do not have Free Pascal for %%os%% installed. The OS won't know what to do with your A1 file, so double-clicking to load the file doesn't work.


Tip: When you have another program installed that you know will open your A1, you can select it from the other programs listed (see "Show Apps").


Wrong Version of Free Pascal is Installed

Your Free Pascal Archive file is incompatible with Free Pascal because you might have the wrong version installed. If you do not have the proper version Free Pascal (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. This issue mainly occurs when your Free Pascal Archive file was created by a newer version of Free Pascal than you have on your PC.


Tip: If you right-click on your A1 file, then select "Properties" (Windows) or "Get Info" (Mac), you can obtain hints about what version you need.


Ultimately, most of the difficulties opening A1 files are due to having the wrong version of Free Pascal installed.


Associated Difficulties Loading A1 Files

Although you might already have Free Pascal or another A1-associated software installed on your computer, you can still encounter problems opening Free Pascal Archive files. If you are still having problems opening A1 files, there may be other issues that are preventing you from opening these files. Issues that aren't software-related:

  • A1 file references in the Windows Registry are broken
  • Unintentional removal of the description of the A1 file inside the Windows Registry
  • Corrupt install of Free Pascal or other A1-related program
  • Something has caused file corruption of your A1
  • The A1 is infected with a virus
  • Hardware related to A1s has device driver corruption
  • Windows cannot load your Free Pascal Archive file due to insufficient resources (eg. RAM)

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