A good start might be saying what file format it is, where you obtained it from, and if possible the application or tool chain used to produce it. How big it is. What OS you are working on. And the when may be important also. You can also look at the headers using eMeditor and others ( https://www.emeditor.com/ handles files up to 16 TB ).
The more information you give the higher the probability someone will help you. It is kind of like if I said 'My pet' won't eat. Without knowing if it was a lap dog or a Komodo Dragon, I might get bad advice.
There are tools like GDALInfo https://gdal.org/programs/gdalinfo.html to interrogate the file. Or try opening it in another application, but don't save over the original.
The format driver used to access the file.
Raster size (in pixels and lines).
The coordinate system for the file (in OGC WKT).
The geotransform associated with the file (rotational coefficients are currently not reported).
Corner coordinates in georeferenced, and if possible lat/long based on the full geotransform (but not GCPs).
Ground control points.
File wide (including subdatasets) metadata.
Band data types.
Band color interpretations.
Band block size.
Band descriptions.
Band min/max values (internally known and possibly computed).
Band checksum (if computation asked).
Band NODATA value.
Band overview resolutions available.
Band unit type (i.e.. “meters” or “feet” for elevation bands).
How do you resolve the"'Unsupported compression type' error in ERDAS? I have tried various versions of ERDAS 9.1, 2014, 2015. But the problem persists in all. Raw data of Landsat 8 is not easy to import and therefore development of other products in ERDAS.