The best option I can think of is to download an earlier version when it still supported Windows 7. According to some searches I made, 2.10.38 is the latest one to have this support, you can download it from their official webstie here: Index of /gimp/v2.10/windows/
Some other sources claim that Paint.Net is also able to handle this format. It also has the same problem that current versions don't support Windows 7.
My Computer
Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba Sattelite A665-S6092
OS
Windows 7 Ultimate x64
CPU
Intel Core i7-740QM
Memory
8 GB DDR3
Graphics Card(s)
NVIDIA GeForce 330GT
Screen Resolution
1366x768
Hard Drives
Samsung 840 SSD 500GB
1TB USB3 external HD
Cooling
Coolermaster Notepal U3 notebook cooling pad
Internet Speed
3mbps ASDL
Antivirus
ClamWin 0.98.7
Browser
Opera 12.17 x86 (main), Firefox 38 (sec), IE11 (last resort)
The best option I can think of is to download an earlier version when it still supported Windows 7. According to some searches I made, 2.10.38 is the latest one to have this support
. Is there any alternative or maybe new GIMP for Windows 7? Please help.