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Step 1: Double-Click the File
Before you try any other ways to open OLK 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 OLK 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 OLK files, like Outlook Address Book or MS Mail Mailbag Lock. 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 OLK file. Files with the OLK extension are usually Data Files. If you’re not sure what the file type is, follow the steps below to find it:
Using Windows:
- Right-click the file’s icon
- Click “Properties”
- Find the file type listed under “Type of File”
Using a Mac:
- Right-click the file’s icon
- Click “More Info”
- 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 OLK or that open Data Files. If this still doesn't help, move to Step 4.
Step 4: Check with the Software Developer
The most common programs associated with OLK files are all created by different software developers. These developers can help you if you’re having trouble opening your OLK file. Find your program in the left column of the table below and contact the developer listed in the right column.
| Software | Developer |
|---|---|
| Outlook Address Book | Microsoft Corporation |
| MS Mail Mailbag Lock | Unknown |
Step 5: Download a Universal File Viewer
If you have completed Steps 1 through 4 and you still can’t open your OLK file, it’s time to try a universal file viewer like File Magic (Download). A universal file viewer is a program you can use to open hundreds of different types of files (depending on the format). Note: If your OLK file isn’t compatible with a universal file viewer, it will open in binary format.
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1File types that are unsupported can be opened in binary format.
