BLEND extension is used by 3D project files and animations created with 3D modeling tool Blender.
After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the BLEND1 file after converting to BLEND may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from BLEND1 to BLEND to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting BLEND1 to BLEND does not meet your expectations, you can simply try to find on the Internet a different version of your file in BLEND1 format, properly converted to a BLEND file by someone else. If this fails, use the information provided in the further part of the website.
Unfortunately, if after performing the two previously described steps (trying to find your BLEND1 file converted by someone else, and the attempt to convert it to BLEND on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the BLEND1 file in its original format (without conversion to BLEND file). Such a solution will be difficult to implement, but it certainly will give the best result.