| File Extension: | PTO |
| File Type Description: | Hugin Project File |
| File Type Developer: | Unknown Developer |
| Primary Associated Software: | Hugin |
| Primary Software Developer: | Open Source |
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Open Source developed the PTO file extension, also know as a Hugin Project File file, for the Hugin software package. Our internal web tracking data indicates that Windows 10 operating system users, and those living in United States, are the most likely to use Hugin Project File files. In most cases, these users are surfing the internet using the Google Chrome browser.
 | Hugin by Open Source |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
 | FreeBSD |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .CBW | Open Source | Page Layout Files | ComicRack Webcomics Data |
| .F | The Eclipse Foundation | Developer Files | Fortran Source Code |
| .LRX | Sony | eBook Files | Sony Portable Reader File |
| .PLI | IBM | Developer Files | PL/I Source Code File |
| .USR | FileMaker Inc. | Database Files | FileMaker Pro Database File |
| .JOINED | Freebyte | Data Files | HJ-Split Data File |
| .SR | Sun Microsystems | Raster Image Files | Sun Raster Image File |
| .LA | Open Source | Audio Files | Lossless Audio File |
| .PMB | Polar | Graphic Files | Polar Uplink Tool Bitmap File |
| .DPR | Niklaus Wirth | Developer Files | Pascal Source Code |
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