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Step 1: Double-click the file.
Locate the SPEF file icon and double-click it. If you have the right program installed, it should open the file automatically. If it doesn’t, move on to Step 2.
Step 2: Look for another program.
If the SPEF file doesn’t open when you double-click it, you probably don’t have the right program on your computer. There are several popular programs that can be used to open a SPEF file. Try one of the most common programs: Standard Parasitic Extraction Format or SP Text Encoder Encoded Text File.
Step 3: Check the file type.
If none of the above programs will open your SPEF file, check the file type to make sure you have a program that can open that type of file. Most SPEF files are Uncommon Files, but there’s a chance it might be another type.
You can find this information in the file’s properties. On a Windows computer, just right-click the file and click properties, and look for the file type under “Type of File.” On a Mac computer, right-click the file and click “More info,” and look for the file type under “Kind.”
Step 4: Get help from a developer.
If you can’t figure out how to open a SPEF file, a developer can probably tell you how. Find the program you have in the table below and contact the developer of that program.
| Program Name | Developer Name |
|---|---|
| Standard Parasitic Extraction Format | Windows Software |
| SP Text Encoder Encoded Text File | SP Programs |
Step 5: Find a universal file viewer.
The easiest way to open a SPEF file, or any kind of file, is to use a universal file viewer like File Magic (Download). You can use it to open many different file formats. If it’s not compatible, the file will just open in binary.
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1File types that are unsupported can be opened in binary format.
