lfd.Nr: Extension Erläuterungen Hersteller/Programm
1 \.aac    
2 \.abk Corel Draw AutoBackup    
3 \.ac3    
4 \.aca    
5 \.accda  

    Microsoft Office 2007
6 \.accdb  

Microsoft Office 2007
7 \.accdb \Access.Application.12

Microsoft Office 2007
8 \.accdb \Access.Application.12\ShellNew

Microsoft Office 2007
9 \.accdc  

Microsoft Office 2007
10 \.accdc \Access.ACCDCFile.12

Microsoft Office 2007
11 \.accdc \Access.ACCDCFile.12\ShellNew

Microsoft Office 2007
12 \.accde  

Microsoft Office 2007
13 \.accde \Access.ACCDEFile.12

Microsoft Office 2007
14 \.accde \Access.ACCDEFile.12\ShellNew

Microsoft Office 2007
15 \.accdr  

Microsoft Office 2007
16 \.accdr \Access.ACCDRFile.12

Microsoft Office 2007
17 \.accdr \Access.ACCDRFile.12\ShellNew

Microsoft Office 2007
18 \.accdt  

Microsoft Office 2007
19 \.accdt \Access.ACCDTFile.12

Microsoft Office 2007
20 \.accdt \Access.ACCDTFile.12\ShellNew

Microsoft Office 2007
21 \.accdt \ShellEx

Microsoft Office 2007
22 \.accdt \ShellEx\PropertyHandler

Microsoft Office 2007
23 \.accdu  

Microsoft Office 2007
24 \.acf    
25 \.acg    
26 \.acl    
27 \.acl Corel Draw 6 keyboard accelerator    
28 \.acm Used by Windows in the system directory    
29 \.acp    
30 \.acp  Assistant Preview file   Microsoft Office
31 \.acs    
32 \.act    
33 \.act Microsoft Office Assistant Actor file    
34 \.acv OS/2 drivers that compress and decompress audio data    
35 \.acw    
36 \.ad After Dark screensaver    
37 \.adb Appointment database used by HP 100LX organizer    
38 \.add  OS/2 adapter drivers used in the boot process    
39 \.ade    
40 \.ade \Access.ADEFile.11 Microsoft Office 2003
41 \.ade \Access.ADEFile.11\ShellNew Microsoft Office 2003
42 \.ade \Access.ADEFile.12 Microsoft Office 2003
43 \.adm After Dark MultiModule screensaver    
44 \.adn    
45 \.adp    
46 \.adp \Access.Project.11  
47 \.adp \Access.Project.11\ShellNew  
48 \.adp \Access.Project.12  
49 \.adp \Access.Project.12\ShellNew  
50 \.adp  Used by FaxWorks to do setup for fax modem interaction    
51 \.adr  After Dark Randomizer screensaver    
52 \.af2  ABC Flowchart file    
53 \.af3  ABC Flowchart file    
54 \.afm  Adobe font metrics    
55 \.ai    
56 \.ai  Adobe Illustrator drawing    
57 \.aif     
58 \.aif  Apple Mac AIFF sound    
59  \.aifc    
60 \.aifc  Similar to AIF    
61 \.aiff    
62 \.aiff  Similar to AIF    
63 \.ais  ACDSee Image Sequence file    
64 \.alb  JASC Image Commander album    
65 \.all  Arts & Letters Library    
66 \.ams  Velvert Studio music module (MOD) file    
67 \.ani    
68 \.ani  Animated Cursor    
69 \.ans  Canon Computer Pattern Maker file that is a selectable list of pattern colors    
70 \.ans  ANSI text    
71 \.api    
72 \.api  Application Program Interface file; Adobe Acrobat  
73 \.apr  Lotus Approach 97 file    
74 \.aps    
75 \.aps   Visual C++ file   Microsoft
76 \.ARC    
77 \.arc  LH ARC (old version) compressed archive    
78 \.ari  Aristotle audio file    
79 \.ARJ    
80 \.arj  Robert Jung ARJ compressed archive    
81 \.art  Xara Studio drawing    
82 \.art  Canon Crayola art file    
83 \.asa    
84 \.asa  Microsoft Visual InterDev file    
85 \.asa  ASCII text    
86 \.ascx    
87 \.ascx \PersistentHandler  
88 \.asd  WinWord AutoSave    
89 \.asf    
90 \.asf   Advanced Streaming Format file   Microsoft
91 \.asm    
92 \.asm  Assembler language source file    
93 \.asmx    
94 \.asp    
95 \.asp  Active Server Page (an HTML file containing a Microsoft server-processed script)    
96 \.asp  Procomm Plus setup and connection script    
97 \.aspx    
98 \.ast  Claris Works "assistant" file    
99 \.asx    
100 \.asx  Cheyenne Backup script    
101 \.asx Advanced Streaming Redirector file  Microsoft
102 \.att  Rasterbild (AT&T Group 4 bitmap)   
103 \.au    
104 \.au  UNIX sound file   
105 \.aux Steuerdatei fuer Audio (Windows)  
106 \.avi    
107 \.avi   Windows movie  Microsoft Video
108 \.avs    
109 \.aw    
110 \.aw HP Advance Write  
111 \.awd  FaxView document